[apologies for hijacking this thread for a moment]
Bill,
All due respect, and just for clarification ... foreigners (not just 'American's') can buy property anywhere in México. The issue with the restricted zone (within 100 km of a border, and 50 km of a coast) is that it disallows foreigners from direct ownership of what they've bought. There is a simple mechanism to deal with this - the fideicomiso (bank trust where the bank is the direct owner, but grants the buyer all rights for a renewable 50 year period); as well as forming a Méxican corporation with the buyer as an officer, then using the corporation to buy the property.
And yes, most Méxican timeshares are right-to-use. A handful, including the one I have in Puerto Vallarta, are owned by Méxican corporations whose 'officers' are either persons or other corporations in other countries.
Foreclosure is not an issue - it's breach of contract. Proving fraud would be difficult when the timeshare company would just provide a copy of the contract to the credit card company/bank, stating what you agree to pay, and pointing out your signature on said contract. And taking a position that they 'told' you you would receive benefits that they later never provided is moot because, again, it wasn't in the contract that you signed.
Again ... apologies for the temporary hijack.