Okay, I'll bite. I looked at the site. I plugged in the dates for our upcoming LAS holiday trip and it came up with several vehicles, from very reasonable in cost to totally out of line.
The "premium" insurance, which looks like the only one that really protects you, and even it appears to have some (IANAL) holes in it, is 40% of the trip price, so do some grade-school math and multiply all prices by 1.4.
The numbers appear, to me, anyway at a cursory glance, to be similar to the usual prices from the rental agencies, or at least within the same ballpark.
As for renting my car out????? NO {f-bomb}-ing way! However {wheels turning} it might be interesting to do the numbers and see how much you might make by buying a second car and renting it out (almost) all of the time. I wonder how many of these vehicles are of that type? I'm sure others have thought of it!