I think the bonus structures of players' contracts vary a lot making it almost pointless to discuss. Some will get sign-on fees upfront, some will get them spread out over the length of the contract. Same thing goes for loyalty bonuses. Some will have a higher bonus and lower wage, others the other way around. Some will have in their contracts that a transfer request takes away their right to outstanding bonuses, others won't. The main effect of a transfer request is still upsetting the fans and management of the current club, helping to push the move through. But as shown by us last summer, you can of course also just ignore it and move on and it will be forgotten eventually.