I'm all for it personally. I see it as two things. One, a means of earning. Two, a means for maintaining my vehicle. I am not sure of criteria as in how many miles driven per day / week / month or etc. or where does come into play on that or not. The next would be do I have to keep literature for the advertiser with me or not to hand out.
I certainly would not feel embarrassed to drive with a skin wrap on my Honda Fit. If it paid enough I would have the car detailed with a high quality polish and wax by a professional before the wrap. The wrap I think would offer a longer life to the finish. If the wrap was changed say one or twice a year it would offer some fun too. The only challenge is I do not drive but maybe twenty miles a week.