To answer your questions:
1. Yes they can (I'm level 6 and have managers at level 4 make offers for my players. Usually crap ones). They can only bid for the highest possible quality that 5* can give them (for example, a level 4 player can only go for Q39 at their level as it is the highest point of a 5*, just like you can only bid for a Q44 at your level as it is the highest point of a 5*). I sold, what was to me, a 3* DC to a manager who would see him as 5* at level 4 a couple of days ago.
2. They can only negotiate on players that are on their negotiation list UNLESS a manager is on their server and the player is 5* or below.
3. **** no. Who are you, Roman Abramovich?![]()
Hope this helps.