I'm not sure what kind of villa you are looking at, but I know for us, renting is much cheaper. Looking at a trip next year with 4 adults/1child (17yrs) in a 2 bedroom AKV savannah view and this is what I come up with:
I'm using the dates for this year Sept 5-10 since Disney is offering a discount.
AKV 2 bedroom non-savannah view through Disney: $2863
AKV 2 bedroom savannah view 192 pts: I have been renting from the same person for $9pp= $1920. Even at $12pp=$2304
As you can see, for us it's a significant savings! True, we don't get free dining, but we find it's way too much food anyway! And I don't mind making my own bed and I usually don't clean our bathroom everyday, anyway. Our tickets are usually bought through
UT, which is not a significant discount, but a discount nonetheless.
In the end, you have to figure out how you like to vacation, your budget, trust level in renting and just go with that.