Well, its been almost six years since your question was posted and there are no longer any Villas for sale for under $75,000. There are still a few that are in less desirable locations and in need of renovation for $80,000. However, the better A floor plan units that are updated are over $100,000 and there are not many for sale.
One constant comment I see is that building 1 and 2 are the more desirable locations because they are closer to the ocean. Unless they happen to have an ocean view this is untrue. Especially if you are renting your unit. The building 3 units rent well in the off season because of the indoor facilities.
I purchased a unit with an A floor plan (outdoor balcony) in building 3 in Oct of 2013 for $52,000, invested $15,000 in renovation and have maintained a constant 90% occupancy since with excellent reviews by my guests. Villa has more than paid its expenses and has appreciated $30,000 to $50,000. Management has done an excellent job of upgrading and maintaining the many amenities. Regime fees are very reasonable and I foresee much more appreciation in the future.