I can also confirm cpalead will not affect your search rankings at all as google cannot understand the java. Also i rank #1 for <watch show name> and <watch show name free>
CPAlead pays very nicely, but your signups go down by quite a bit. The positive side effect is that most of them are serious, non-abusive users.So it doesnot effect google look on your site.There are sometime your website pagerank goes down because of various reasons.
Apart from it being 1 small factor amongst many please explain why you think PR5 has all that much to do with your SERPS elbeer?