One is that mortgages will not be available for quite awhile, so individuals will proably need to pay up front. Timesharing means that they can steadily pay for more and more shares until they are full-time. This is not as convenient as a mortgage, since the person can only live there as often as they've paid for instead of moving in at the beginning and paying interest. But its still better than having to pay the whole thing before enjoying any of it.