We occasionally use the lounge in Epcot but I can see us using the MK lounge more often. I agree with you that DVC member are under valued, since the early 2000 perks have decreased.
There really isn't a downside to renting points if you're using a reputable broker. Some things can be less convenient as others above have pointed out but the money saved is worth it.
You can call housekeeping and request a certain time for them to check the room. We give them the time we want for our entire stay, they are very accommodating.
We were unable to book for the preview because we didn't have a valid resort reservation. We did book a cash room at the Grand Floridian thru the WDW website. I called member services and they said I needed to call them directly to book a cash room and then it would have been valid. This is...