Aside from the lost storage space beneath the bed... there's the issue of company.
It's more fun when you don't have to worry about falling off the bed - it's more more amenable to extremely kinetic activities. This includes at least one double-blindfolded study.
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: