Raise humble bundle amount afterwards to get above averages?

I think you can only do tat on the ongoing bundle, not in previous ones.

As those bundles are closed, you cannot raise the ammount nor get new games from them. That's only available after purchasing, but before the bundle ends/closes.

Those bundles ended already. You can't do it for bundles that have ended.

If you didn't pay above the average you cant go back and do so now they are long over, sorry.

I thought you can raise the amount until a month after the end of the bundle

It is possible to rise the amount of money you spent but only until 30 days after the bundle ended.

When you really want the games then just buy them somewhere or wait, sooner or later they will be in other bundles again.

uargh.. too bad. ok. that would explain why there's no raise-button.
thanks for the info

But if your lucky and get A LOT of people to donate they 'may' add an old bundle into that bundle!