Someone mentioned that they don't really expect much traffic back. This is more or less the truth, but consider the fact that a majority of TGP's get spidered by various Search Engines all the time. There are thousands of galleries getting indexed by the engines every day.
That gallery has 3-4 chances to get spidered, and once it's in the engines, those 3-4 recips are sitting right on top of the page.. link about how appealing that looks to some idiot searching for free pics and looking at the 120th result of his search.. "Blah Blah TGP, Links to 100,000 Free Pics!"
I've always tried (tried is definently a key word here
) to go back after a month and strip the recips off my galleries that have been added to the engines..
Sorry for the long post