I can't see us doing this on our April trip, one of those days is already a MK day for us, so for our two MK days on the trip the park is open until 11pm and 12am which makes for a long day to begin with.
I think it would possibly make sense for someone vacationing elsewhere in FL that wants to go to Disney for a day. We did the beach and Legoland, but just couldn't pass up seeing Disney while in FL. We bought MNSSHP tickets so we could do 4-12 at a cheaper cost than a one day ticket. Not sure if charging more than a one day ticket for a 7-2am entrance (one less hour than a party) would ever make more sense than just buying a one day and having a good touring plan. The only way I would consider it in that situation is if they severely limit the number of guests to keep lines down, which I doubt they will do.If you wanted one day to hop in a weeklong vacation it would be WAY less to add Park Hopper and an 8th day to your ticket. You'd have enough left over to buy enough ice cream to make yourself vomit.