Really, the perk is for whomever PAYS for the reservation. Disney does not care if you pay for a room, take the EMH perks but don't sleep there. It also isn't unethical. The cost of the nightly reservation entitles one to sleep there, the use of EMH, and free parking. You have the right to use all or NONE of those, but you have have the legal obligation to PAY no matter what. Disney requires 45 days in advance cancellation, and there are people who end up paying for rooms they can't occupy and that Disney doesn't fill with other guest. Yet by the logic being used by folks on this board, it's unethical to do this, or are you really suggesting you have the right to judge others and impose some secret code of conduct on them? Would you feel better if they slept in a tent rather than a bed and paid for 1 rather than 2 accommodations that night? They aren't paying LESS. They aren't getting a super secret deal that you cannot. Sure, we could all double book hotels AND FW, BUT who wants to??? There aren't many people who want to pay for FW just for EMH and parking. No, we don't want Disney to stoop to Universal's level of selling Fast Passes, but Disney already IS selling EMH by staying on site the only way you can get it. That's fine. On site should have special perks.
Hey, OP, if your friends park their car at their camping spot, maybe people will calm down. Really, I've never thought of it, think it's pretty clever, insane for the sleep deprivation, but I'd go for a family suite at All Star Music or price 2 rooms at All Star Sports (consistently the least expensive resort). On site is the best way to utilize EMH.