Yes, true...adswaps can and will build your list. But if are not careful...you will burn out your list. I've seen marketers promoting 3-4x per day. Let's say you promote for once, guy who did aswap with you sends out 1, maybe someone else who did with your guy send out 1 email. That's 3 emails per day. If i see 5-6 offers coming to my email inbox per day...i would unsubscribe from all...just to keep my inbox empty.