why under my level contribution?

Probably because of a price drop in steam, or a game was retroactivly added to the bundle list., Please read the FAQ and guidelines. Another nifty tool is the search bar right under the new discussion button that allows you to search for questions already asked such as this one. If you want to have some fun comment formatting is here. Here are some good threads as well.

All your Heroes of Might And Magic® V Pack giveaways finally had the proper CV applied to them.

I had thought it would be even lower.

39 copies of a $0.20 game.

surely you wouldn't expect $30cv for each copy, right?

not that you overpaid it anyway, you spent $0.20 and got $4.5cv/game... still x25 $:cv profit.

Abuses CV system
Complains about drop when loophole is fixed

View attached image.