Who gives the bonus?

Every campaign gets a 100% bonus if it's within the set range of $25 - $2500. That's a lot of money when given to a couple of campaigns. So, the question of where this bonus comes from is valid and very important.

We run an advertising program, whereby companies pay to place banners on various sections of the website.  The money collected from advertisements creates the fund that provides the bonuses for these campaigns.