Also check out Timeshare Users Group - Timeshare Owners Helping Each other, Unbiased Timeshare Information for All Owners, Buy Sell Rent Timeshare
Timeshare Users Group.
Probably a good idea to join before making any investment.
Purchase price = 3x outright purchase price
Resale price = .25 of above
Maintenance fee = $200 to $800 per week
Trading fee = $400 (250+150)
Simple math - $600K oceanfront condo
Per week - 600/50 - $12k - timeshare new = $36k
Resale - $9k with ROI of 10% then $900
Maintenance - $350
Use for 1 week - $1250
Swap instead - $1650 or $236 per night