Dean, I agree that RCI has some nice Mexico resorts without mandatory all-inclusive fees, and that members can trade into them with a weak trader. The main problem though, is what I mentioned in my last post: Many of the nicer non-AI Mexican resorts are managed by the same company (Grupo Mayan), so they all have the dreaded "1-in-4 rule", except this case it's actually 1-in-5. (For those not familiar with RCI, many RCI resorts only let RCI members trade in once every 3, 4, or 5 years -- this is what is known as "the 1-in-4 rule.") So, an RCI member can only trade into any of the Grupo Mayan resorts once every five years. That's one reason I suggested using an independent exchange company; none of them have 1-in-4 rules.
About buying a non-DVC timeshare for trading, I agree with you 100%. Definitely, if someone is planning to trade regularly, buying a non-DVC timeshare for trading is the way to go, regardless of whether they are trading via RCI or through an independent. The annual fees (and buy in cost) for DVC is just too high to make it cost effective to use for trading on a regular basis. There are lots of strong traders out there that cost less than $1000 to buy and have fees under $500 a year.