Stuff like this should be automatic buy not a bid war. A basic trainer or level 2-3 should never be 250k$+ or more to buy sign or for a team.
Fortuntely, they aren't. Heck, level four guys with salaries under 15k routinely close with bids under 10k, at least every single time I've looked. Perhaps you're looking at the market for some other game with different rules. That would explain a lot.
Agian prove it wrong beyond words. low level trainer price are the same as top level buying and bidding and getting more expensive some jumping 300$ a week in the top level.
The percentages have been posted, I've posted the formula you could use to find out the salary in excel. Frankly, you're making this all up anyhow because you can't even see another team's staff to see what the increase was, so please stop trolling us.