I was approached this week (July 2016) by Infinity Development Inc. They were offering almost 3X what I paid for our timeshare at the Mayan Palace in 2011. Sounded too good to be true, right? So when they sent the Letter of Intent, and asked that it be returned so they could get back to their buyer "within 72 hours" I decided to research on internet. Found very little, other than this thread. So I called Mayan Palace customer service. They confirmed that people had been scammed - money up front, non-existent Mexican taxes, etc. etc. I'm just waiting for these jerks to call me back!
DO NOT fall for them. You can sign the letter of intent, then wait to see if they will ask for money up front. I'm going to tell them to take the money out of the closing, and send me the balance! Let's see if that flys! My guess is it wont'.