I do also know a few guys who will use the 2 hour steam refund window as a demo system, but honestly I'm usually happier to seek out a pirate copy rather than waste a real person's time at customer support for something I can just as easily do independently.

Plus I think the more you do treat Steam's refunds like that the more strict they get about what they'll let you do, understandably so, and I'd rather not strain their hospitality. Same reason I always get my refunds as steam credit, rather than real money. It's objectively worse for me in the short term, but they've generally been good enough to me as a customer than I'd rather do that than make them eat extra bank charges for an almost negligible inconvenience.