My father rents from it very occasionally, he finds it a lot more convenient than old video stores since it's at a place he goes every few days, and their business model works for him whereas I don't think Netflix's does.
I do wonder at what point the overhead of stocking the machines exceeds the income earned by having one conveniently located to pretty much anyone. Can they afford to keep them stocked with all the latest videos when they have one at every gas station and Walmart in a state?
On a related note we recently tried out the new redbox streaming app on the PS3. It was not a... smooth... experience. Errors galore, images failing to load, and actually getting the video you bought to play is pretty much a roll of the dice. I think their servers were woefully unprepared for the load they were subjected to.
Maintenance is a bigger unknown to me, but seeing as how they're in their 3rd? generation, they seem to have that under control. Capex could be the big one, those machines and their DVDs aren't cheap ... but they've been keeping this game going for quite a few years. A serious analysis of their financials would be required to make a guess of that, assuming their public owner breaks them out sufficiently.
Ah, and that company does the Coinstar coin cashing kiosks, so that might improve their servicing situation.
You can fill your gas tank less than twice a month, avoid walmart like the plague, I haven't eaten at a McD in many years, but every couple days you have to buy fresh food at the supermarket... And there is always a short line at the redbox.
In a Blockbuster, you can have a few dozen people looking around at once for the right movie to watch. On Friday and Saturday nights, they were often packed. But a kiosk, you have to wait for the other person to finish browsing and purchasing. Seems like they work precisely because the demand is just low enough that there is not too much contention for any one kiosk.