Yes let's work it through.
Hypothetically Juve sign him on a free, with a £300k a week basic weekly wage. In a year's time they intend to flip him, because they purely signed him for profit. Eriksen, having pretty much had his heart set on Barca, Real or Juve, left an upwardly mobile Spurs where he was valued as a first 11 player in a system that gets the best out of him, and now he's being told he needs to go...where? Bayern? Dortmund? Inter? Roma? Who has the money? Who has the need? Who is going to want to take on his wages? Why is Eriksen going to want to do it?
I never actually said a club would buy him with the intention to flip him. Only that if they did buy him, and later sell him (for whatever reason) then they would profit. Hence the no lose aspect of the post. Either he plays and is a success, or they sell and profit - no lose.
Where will he go? Whoever is actually interested will dictate his options.
Who has the money? How should I know? There are plenty of very rich clubs around, there will be options.
Who has the need? Again, how should I know? Teams needs and wants change drastically, quite often in very little time. New manager, new system - suddenly someone like Eriksen is essential. The point remains, a player of his quality should have options at the top end of the scale.
Who is going to take his wages? Again, plenty of clubs around happy to pay big money. Just as has already been mentioned, clubs often supplement wages to make deals happen. Wages really not that much of a deal breaker.
Why would he want to do it? Why did Crouch want to leave Spurs and go to Stoke? Answer: He didnt. But he was told in no uncertain terms he had no future at Spurs, so it was in his interest. Theres no reason at all to think Eriksen would be immune to these pressures. If he wants to play, he might need to move.
Why is a club going to risk signing a player to a 4 year contract on 300k a week, with the full intention of flipping him? Why is Eriken going to go along with it? He'd be well within his rights to stay and take his guarenteed money. Maybe he gets a move to 'play football', and effectively give up the guarenteed cash he's getting at Juve in this example, but he's ending up at a club worse than Juve and worse than Spurs.
Again, dont get hung up on this idea of flipping him. Its a very basic point to show that clubs trade players, that when buying a player value is a key part of the deal, and the fact they
could profit on selling him would make it more appealing. Its really simple.
Why would Eriksen go along with it? Its his dream move and he'll be intending to make the most of it. Again, really simple.
In your example, it's the same. Joins Madrid. Gets paid 300k to sit on the bench. Because he's a free agent and wants to milk it. All of a sudden Real have to convince Eriksen to give up guarenteed cash. He's no longer a free-agent, Bayern would have to pay a hefty fee to make it worth Real's while, he hasn't played good football in a year and there are younger players coming up - why are Bayern going for this? And why is Eriksen? And why would Real take the risk of signing a multi-year contract with him on huge wages if they intended to flip him?
I can't think of an example where it has really happened with a top player. It makes sense for Eriksen to move if he can get big money. It doesn't make sense for him to move if he's going to sit on a bench and not get big money - and no club that intends to flip him is going to risk guarenteeing him big money because it gives Eriksen all the power.
Which brings me back to my first point - if Eriksen is going somewhere, he needs to be sure he's going to be a first 11 player to really reap the rewards.
In the great conspiracy you are weaving, I think you are really just majoring in the minors and missing the fundamentals.
Eriksen would move to Juve/Madrid/wherever with the full intent of making it work. Achieving his aim of "something new" and cracking on with being a footballer. This is precisely what all players do when moving.
That he could do that and pick up a big payrise is just icing on the cake.
Football clubs are not so sentimental, they are actually multi million (billion?) pound BUSINESSES.
They see players as assets. And a key component of any asset is the value it holds.
When an asset comes to you for free, but is actually rather valuable, thats a good thing for a company that trades in such things.
Juve/Madrid/wherever can sign Eriksen safe in the knowledge that either he works out on the field, or they cash on him later, and either way its money in the bank. And that wonderful aspect of not having to pay for him means they can give him a premium wage to sweeten the deal and entice him to join.
I can appreciate the narrative you are trying to convince of, that theres little point in him moving, that he should realise he is better off sticking with us, grass isnt always greener.... But honestly I think its really just denial.