Value for 1 week in a top spot of the popunder console for teensforcash?
 

How much do you think it's worth?

Or better yet, how many trial signups could it generate in a week?

not a lot, since they are giving it as a price.
i guess it could be around 2-3k with 35 PPS program in week. but it depend on sponsor off course.

very hard to say, depends what you are promoting etc. maybe ~$500 per day

Q said it is about $600-$1000

I'd say around that

do you have access to see how much traffic that flows there daily? It might help abit......if not my guess would be maybe 10-20 sales per day......