Personally i feel that bandum exp gains are far to low for the amount of difficulty it takes in capturing a bandum. i captured another villages bandum at level 22 (with the help off higher level villagers fighting off enemies) and i got a grand 1000 or so exp cant remember exactly and i also capture my own villages bandum and got 695 exp so all in all this is too low.
Reasons why i think this:
1) Capturing a Bandum is much harder then killing sasuke and i get between 3000-4000 exp for killing sasuke.
2) Only 1 person can capture the bandum every 30 minutes or something like that, so raising the exp, isn't even that much when you think about it.
3) Not only are you fighting against the village who owns the bandum to take it from them, but in reality your trying to race your own villages to capture it as well because it is worth exp and good inf gains.
this is just how i feel, i find its almost not worth my time to try and capture when i can do b rank missions and get more exp for it, the only benefit is that the village gets the 10% boosts, the capturer dont get much but just earns the reward for the village. even 5000 exp would be enough to satisfy me, gives it that little bit more to make it worth while to to try