Is there a contribution limit?

$30

Thanks for Skyrim

The limit is 20% of the non-bundle contribution or 30$ whatever is higher.

Yes, but no.

There is a limit of $30 if you only giveaway bundle games. If you giveaway none bundle games however that limit increases by 20% of the value of non bundle games that you have given away.

For example, gifting $100 of non bundle games gives you $30 of base bundle value plus 100*0.2 = $20 more bundle value, so you could giveaway $50 worth of bundle games and get the contribution for doing so.

It's all in the FAQ ;)

First 25$ of bundles counts as normal games, all the rest after are gained everytime you make a non-bundled game according to 20% of the game's value. EX) give away 40$ game, you also get 8$ more if you gave at least 8$ of bundled games that haven't been added to your contribution value