What?!
One, I would rather a 31 year old Ade ovee a 98 year old Berba.
Secondly, Berbatov couldn't command 100k in his prime.
They're both lazy, but Berbatov has more ability IMO. Meaning age doesn't play a huge role, they'll both be pretty immobile.
Secondly) He's been at Man Utd (110k pw) and Monaco, not exactly known for bartering hard on their players wages. Whether he's worth 100k or not, people don't tend to take huge pay cuts when they move jobs. Fulham made him their main player, and could offer him a fancy lifestyle in the swankiest part of London. I wouldn't be surprised if he was on 80 odd there.