You're saying Dortmund should've just doubled the wages of their top players. You also seem to think that clubs can just magically lower wages and get away with it and you cite clubs who are underachieving with some of the highest wage bills in Europe (more than twice the one of Dortmund btw) as positive examples and somehow you seem to be under the impression that a club with €280m turnover can financially compete with a €500m turnover club.
Let's be honest here. How much do you know about Dortmund, especially their state in 2013? The club's officials, who had financial experts among them and who knew all the numbers and projections intimately, came to the conclusion that €5m was the maximum they could offer. Now a couple of years later you're like: lol, morons, just should'Ve paid them ten, EZ.
Seriously?
I used the clubs with big wage bills as examples of how if players are paid well, they won't itch for a move.
They can't finanancially compete with them, but they can manipulate their wage structure in order to pay deserving players big wages. The reason those clubs have such huge wage bills is cause they give massive wages to everyone, not just their stars. You can just reduce the wage bill in certain areas. Finding good players isn't hard, its finding world class players that's a pain in the arse. Sell them, get in new fresh cheap talent on lessor money than the outgoings.
These financial experts have cost dortmund serious talent these past few years. Heck, the lewa debacle cost them a 50 mill-60mil euro player. Mkhi just left on his last year of his contract for less than his true total worth. Not sorting out contracts has cost them, despite how intimately the board knows the financials.
That could easily destroy the club if those top players get injured. Some of your better squad players will leave, if you kill your wage structure like you suggest. Your squad depth will be significantly weaker compared to the elite teams and considering Götze's, Kagawa's, Sahin's and Gündogan's injury record this sounds like a completely insane idea. It's nothing but one huge gamble.
Finding good squad players isn't all that difficult. Kuba, Grosskreutz and the like aren't difficult to replace. Replacing a Lewa is a mission. I don't think their depth has ever been impressive. Before the first 3 left, their injury records weren't bad, despite Gundogans injury record they still managed to get him off the books into another club. Made money while doing it too. You can't think too much about injuries in football cause they are an unknown.
Paying serious money for squad players is totally unnecessary cause of home many players of that standard that there are in world football. Its what wenger has done these past 10 years and its hurt him cause it reduced their ability to pay stars top dollar. They ended up losing the stars, so struggle to win.