Good (50+ s/u per day) affiliates just don't sign up for new programs anymore, is what I consistently hear. It's harder to get those affiliates, so for new programs at least, the affiliate sales are nowhere near inhouse sales. Since I launched, affiliates have made around 8% of my total sales (which isn't a huge amount in the first place

).
I'm not sure what angle you are coming from though as to whether you should be sending more traffic to sponsors, or parking pages. How does the amount of affiliates who make sales with me, or anyone else, determine how many sales
you would make with them if you sent your on-target traffic?
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