Sorry to say I do feel some value should be attributed to club members in the form of a transfer fee.
After all if you are a new club attracting unexperienced players helping them to progress teaching them the club system etc only to have the move to a bigger club it becomes a bit personal.
I do not know what form the fee would be in problem until WGT setup the BANK system is who gets it?. I would suggest some form of transferable amount of XP to the selling club not credits as this is to mercenary all I want is some form of recognition that deters larger clubs from contacting members of other clubs. The XP would compensate the club by helping it level up with the extra XP.
Also seems WGT should fix the messaging system I tried to send a message to all my members but it does not seem to work. Finally is there a tutorial on how to use the various messaging options in the game, my new members seem to find it hard to do.