That happened in the past but not so much now IMO.
- People did it for Early Entrance (which used to be 60 minutes but is now only 30).
- People did it for the free Magic Bands but now nobody gets free MB's since they are BAU now.
- People did it for free parking at the theme parks but why book a $100+ campsite per night to save $30 of parking?
- People did it for the ADR booking advantage (which I think for now is only +10 for on-site resort folks?). I don't know, I don't stay off-site.
Disney saw folks doing this and would have several empty campsites that showed as fully booked. But they aren't satisfied with that - they want folks IN the sites AT the FW resort SPENDING money for meals, activities, golf carts, dinner show, horse rides, and boat rentals. Empty campsites don't spend at the Fort which is why Disney put in reforms to make this action less attractive to off-site guests (which frees up sites for those of us who want to stay at the Fort).
The benefits of doing this have been mostly removed. But you will usually find someone who might advocate for this who doesn't know the value of their own time or is not up-to-date. It's a net loser proposition in the end overall except for rare, niche situations.
But if someone has money to throw away and burn, I say, 'hey - go for it".
Bama Ed
PS - or are off-site ADR dates now 30 days out versus 60 days for on-site? Is that worth ALL those extra bucks?