Parking at a resort is for those who are either...
1. staying at that resort, which means they get to park there 24/7, or....
2. those enjoying the amenities of the resort...eating, shopping, checking it out.
It is not intended for those who are leaving the resort, other than on a resort sponsored event..boat tour, etc. Many people try to eat at a resort, especially on the monorail line, park their car there, and then head to a park for the day, avoiding the parking fee.
Will anything happen to your car if you park there and then leave the resort? Probably not. Is that what Disney intends for you to do? No.