That's not the point im trying to make Manon.
the point is why even bid on them, trainers come every day or every few hours of the day.. Its not cost effective for manager to be bidding on trainer. Why spend 500K on a trainer? that 500K$ that could have been better spent for that ball club. the weekly salary is enough to keep tem is check in this area of affording.
My point... Bb should set it to just pick him and pay his weekly salary ,not bid war or bidding on any trainer.
The quick answer is "don't spend 500k on a trainer."
Really, though, it's certainly possible to have an alternate staff system. Hattrick does, for example - there's the option to buy a coach at a fixed price with a certain coaching skill, a specific focus (offense, defense or neutral) and a certain leadership level (which modifies the gain and fall of team spirit, which is their enthusiasm equivalent). It can be extremely expensive, but the prices are fixed. You can also convert a player to a coach, which requires having the player in the first place for at least a season, and paying an amount based on their experience and the skill level you want them to have, but there's no extra cost for leadership, so getting a solid leadership player experience can make him a much cheaper option than creating a default coach with that same leadership and skill level.
They handle the need for staff turnover differently, as well - instead of salary increasing (and really, salary on coaches there is inconsequential), leadership decays, and once it falls below the bottom level, the coaching skill drops instead.
There are many things BB does better than HT, and a few that HT does better. I like HT's system here better if only because the thought of being able to convert players into coaches (which means they can never be transferred again, though) is something I think is a nice touch. I think BB's system does seem to require coaches be changed more frequently, since the point where the decay in leadership ends up making a noticeable difference in maintaining team spirit is somewhere around two full skill drops.
But back to the short answer, don't ever spend 500k on a staff member unless there's a really good reason to.