That $500 a week includes new furnishings, linens, property taxes, front desk staff, cleaning crew, lawn/garden staff, pool maintenance, etc.
Then and on the electricity, water, sewer, phone service, a staff to handle reservations, it all adds up.
Try to rent a hotel suite that has a kitchen and sleeps 4 for a week for $500!!!
It sounds like you need to spend some time reading and learning about how a timeshare may or may not work for you, before you buy anything.
For us it makes great sense. We spend our 6-8 weeks a year in units we own, at various Ocean Front resorts and enjoy it immensely.
Does it cost us more that a Motel 6 inland somewhere??? Of course it does, but we are in very nice 2 bedroom suites on the ocean, with full kitchens and nice surroundings.
My folks used to RV, and to save money they would park in Safeway lots at night. This just isn't my idea of a vacation.....
fwiw, Greg