Most webmasters only want the quick upfront.
We're adding PPS to DarkDollars so we can also get the webmasters who want the quick upfront $$$. We may as well, because quite frankly, we'll be much more profitable paying $35 per signup than revshare ;))) It will also attract webmasters who don't "do revshare" to our program. We're revamping our sites now and will probably have an annoucnement about the PPS at InterNext
I don't see PPS going away, but I do look at more of a "you have to qualify to send PPS by sending to revshare first" kind of thing.