So you can drop a half million dollars and spend 2 years of your life in a tiny compartment millions of miles from home to visit a dead, cold, rusty rock without a breathable atmosphere?
I expect there are many people who would find that very unappealing. I also expect that there are people who would put down the money right now if you would let them.
I don't find the idea of jumping out of a plane with only a parachute (that will probably open OK. maybe) to be appealing, yet thousands of people do it every year, willingly, and repeatedly. And that's downright mundane compared to the obvious exoticness and thrill those kinds of folks would get from setting foot on the planet Mars.
Does that sound unappealing to anyone else?