Oxygen capsules

was just reading an article about "02 capsules" that are available in some spas in japan, for about $50/hour. (this is the article on the web).
The capsules give you 1.3 atmospheres pressure and deliver up to 50% oxygen. would be good to have those on some liveaboard dive boats. you could take a nap between dives in one of them and refresh yourself for the next dive.
if you want to buy one, here is a website for o2 capsules (in japanese). the capsule for one person starts from 28,000AUD.