several have been covered but there are lots of good reasons to balk at buying
DVC:
1) thousands of $ upfront plus annual fees require a certain level of financial ability and commitment (and you still need to pay for tickets and travel, etc.)
2) commitment to wdw/fear of wdw burnout (sorta - while you can trade out, the best value is staying at the DVC resorts)
3) DVC not as deluxe as deluxe hotels in some senses (limited housekeeping, sofabeds, no room service at some DVC resorts)
4) prefer to stay on weekends and weekend point costs are higher
5) financing a depreciating (sooner or later) luxury purchase is generally a poor idea
6) happy with value hotels
7) amenities like a kitchen and washer/dryer have no value for you
8) you don't/can't plan vacations 6+ months in advance
9) you enjoy hunting for deals/bargains for each trip
edited to add: i own and am very happy to own but it's not for everyone. there are tradeoffs.