I mail GI and can say, from experience, that no real GI mailer is going to trust that your GI is "good quality" for many reasons. First off, if it was a profitable list you would not be willing to send it to someone with only hope they send you money back. Second, there are so many traps in GI data... a GI mailer would need to be crazy to waste their ip resources on a questionable list. Especially when they very likely have their own list already (they are GI mailers after all). If the scenario is that you don't mail and have this good quality GI data, that's presumably been sitting around for a while, there will be so much bad shit in there. Not trying to be mean by calling you out out like this, but I want this forum to be what it once was. A valuable resource for active/experienced and upcoming mailers. It seems to me like there are a lot of people around here that have some data, don't know how to mail, and want something for nothing...
