Yeah, very common. I remeber during the Euros there was discussion about what the Germans would get compared to the Greeks. It was a big difference. I know Otto Rehagel got plenty of money asa a bonus.
I think it's stupid. As you said it's about pride not money.
I do think that a player on the fence would want to be fairly confident that he can make it into the England team. I think it would be alot tougher to do.