I’m going to earn form this by having access to more web sites. Web site owners are going to earn from this by getting more visitors.

The printmall.co.il web site (an Israeli version of CafePress – they sell specially printed t-shirts and stuff) at the time had published statistics about web browser usage: according to them, Firefox users account for about 15% of the total visits, but – over 60% of total sales!!. So having access to Firefox users should increase web site profitability.
http://mirror.hamakor.org.il/archives/w3c/11-2004/0094.html