Yes, I've been at the top of my server for three seasons now. It is impossible to sell any player, almost impossible to buy a player other than a 29yo Scout. I don't seel my youth players now, I keep them and power train them to get them to 6*, takes heaps of Rest packs but it is the only way to get decent young players now. I had to put real money into the game last season just to stay competitive, and I missed the top 7 for the first time ever.
The prizemoney in the higher levels does not keep up with the cost of running your team.