I am only at level 13 and i really dont know whats it like at higher levels but i do see some high levels getting trebles and such. Look at the hall of fame. Anyway, everyone has to workaround and there will still be those who will continue to do well without negotiations and those who give up. And i do not believe everyone here is at your level. I do sympathise with high level players. Everyone is forced to tank! I dont expect anyone of low quality like you mentioned. I believe someone has already mentioned like its end game at high levels and the game is catered for new players thus encouraging us to tank and stay low level as long as possible to accumulate trophies.
Anyway, at your level i believe even negotiations isnt good enough. In fact, isnt auctions better? Like for quality young fast trainers?