There's a thread on this from a while back. Essentially said the same thing as most of the posters on here. While its doable, it's not for everyone and the cost of insurance and special licensing (if required) would lead to you having to rent it out a lot in order to break even.
I'm not very sharing when it comes to our rig, but I am taking to a campground and getting it setup for some family of ours next year so they can enjoy a vacation together before the dad returns overseas on his deployment. That's way different than just letting someone take if.