Let's face it, haunted houses are designed for our customers to walk through (or ride, if a hay ride). Sense when are we NOT going to let people finish? Unless someone pulls a weapon or physically stops me from attending the attraction, I'm finishing. If they ask me to eat or drink something...then no way -I'll eat (and drink) before I go; or ask me to swim, walk through knee deep mud or manure, climb a 20 rope, etc. We are not an "eat gross stuff industry" or a "ruin your clothes and get a work out industry" -we are haunted attractions. Unless I advertise those other features, I'm not going to require my customers to do them.
I talked to the money back people and they claim there is no trickery, etc. I don't know how else they can do it. In the end, if the customer feels they were scammed or tricked, then watch out because with social media -your haunt will be know as the big scam and that will take some time to recover from. You will have one good weekend and then nothing but damage control after that.
I offer money back as a promo (as noted in an earlier post). If you want to know how I do it send me a note and I will explain.