i have 2 live this week
i dont normally do tgps but when i do it is for volume to run layout tests or to inject some branding, etc and do them as an affiliate...direct signups for the gallery itself are very little but landings from the gally/2nd pagers generate 2-3 sales...some from the original sponsor - some from others, this is on front page listings (3 day) free submits.
even if your gallery is off the prime page, the hun now has a search function so your gals aren't just all thrown to the archives btw
