4) To answer another question that has been raised on here, staff salaries do not go up indefinitely, as it would make no sense for a level 2 staff member to eventually be making $100k/week. So if you really ignore your staff, you'll end up overpaying by a decent factor, but if you're willing to pay higher prices, you can keep a staff member forever and opt out of the system in that way, too.
Wow - better get that I spent $5mil for this stupid trophy designed...
If you can obtain a lvl 7 trainer and keep and then the salary freezes (albeit at an inflated level) then maybe the 1mil+ figures aren't inconceivable after all....
I guess we have to wait to see if the owners of these managers reveal how much faster they think the trainers help improve skill ups by.