AVS Sites vs. Free Sites - Which do you prefer?

[LD]

I'm just getting into avs, and with sheepguy's excellent help, I've got some of the ground rules down and have started to get some traffic. I didn't realize there were so many list that accepted avs, but sheepguy has quite a few on his website, and after he explained a few little avs oddities, I am getting lots of listings. No sales yet, though.

For sheepguy and others: is there any benefit to doing exclusive sites, or should you build a site and list same one on two or more avs list?