Well, they intentionally allowed people to do that.
If someone offers to sell me something for 10c, I'm not going to feel guilty for taking them up on it. (Y'know, unless it's a starving child selling her family heirlooms in order to buy a handful of rice to feed her baby sister... uh... what was I talking about?)
Anyway, in the later bundles they started including an extra goodie for anyone who payed above the average at time of purchase, which was a cool idea.
Oh and for the record, I paid $20 for each of the bundles I bought.