I went through similar thought processes before attending and decided that it was extremely unlikely that I would ask for my money back even if I didn't think the workshop had been worth the cost. That made me decide that the offer wasn't a legitimate one for me to consider as real and I ignored it when making my final considerations of whether to go or not.

I ultimately went and thought it was fully worth it for me. I know 3+ people who follow that pattern who I spoke to shortly after the workshop and 1 who thought that it hadn't actually been worth it but did not ask for their money back.