You do realise Barca can easily finance this and is actually offering money in those heights already? They had a 115m€ bid rejected, that was just the first offer made. Your analogy doesn't quite fit, because Dortmund evaluation clearly doesn't come from nowehere, and Barca seems to be actually ready to up in those heights that you deem "impossible".
In fact, in that analogy you made, the girl asks a guy that actually owns a rocket, but is just reluctant to use it.
I really have no idea where Bvb's evaluation comes from.
Another point is, imo, Dembele and others have a right to act like a dick, force a move and try to lower a price.
For example:
Bvb is asking 150M
Barca is offering 110M max.
Dembele has every right to fake that he is sick and not play matches.
People will reply: he has a contract, he has to play.
But there is a thing when your employee is a dick.
So, Dembele should boycot.
You will reply: he won't get wages. So what? He will get 2-3-4x times more at Barca, he will survive.
A 2nd reply could be: if he won't play, he will hurt his chances in a World cup year.
So, basically:
1. a selling club WON'T sell him in the first place and is putting absurd conditions
2. then, if a player starts a boycot, his club won't play him and ruin both itself (a club) and player's chances to play a World cup
So, who is a dick again in this story for the 2nd time?
What does it say?
1. we won't sell you
2. and if you'll boycot, we will ruin your career, if needed
Awesome, cool guys.
At the end of the day, you have:
1. a buying club. They want him
2. a selling club. They don't want to sell
3. a player. He wants to go.
2 versus 1.
Personally, if I were a player:
1. I would boycot a training and matches. You want to give me a fine? Give me a fine.
2. you will bench me for the whole season? Fine. Bench me
Do this and a club will surely sell you either in January or in the next summer.
Dembele will survive with 3-4 Months without playing. That is the same as a random long term injury.
You can come to Real or Barca only once.
Do everything what you can, man.