I have to say that I choose programs based on what suites my players the best. This is easy for me to say, because traffic is very specific at my sites.. Downside is that I work with less reputable programs. And of course I know this isn’t the best way to go, but nothing better is availible..
But for extra points (higher banner position, etc. Assuming you fit my traffic)
– dedicated affiliate manager
– higher commissions
– personal deals
– targeted marketing materials
– non cash incentives
And the last one (non cash incentives) might work the best for me. I mean, cash is nice, but I think a good gift is worth more than cash..