Just read this a few minutes ago, watch out for these packages that claim to be all-inclusive:
http://ca.news.yahoo.com/sunwing-vac...50649-936.html
This one was offered by Sunwing/Signature/Expedia - and travellers found themselves without the last night at the hotel, therefore they were sleeping in the lobby (at a hotel in Mexico).
And it sounds like the sellers and hotel were well aware of this ongoing scam.