Any requester can go wonky, even formerly good ones. Especially if they are getting crap results, so it's a good thing to apply to everyone until your numbers are so high that you can't (w/out a lot of hard work) be screwed over. Some peoples best money is from unfamiliar requesters. Most of my rejections are from familiar ones that went wonky cause people scammed them so they went overboard in response.
I lost track of where I was going with this. Just use the worst case scenario script and pretend everyone is unknown and never do more than 1-2% of hits.