Did consider it once in an aircraft on the ground at Denver I think (which qualifies for altitude). Managed other activities at that altitude in the U.K but space has prohibited qualifying for full membership. Also thought about it as a business opportunity - take couples to 5280 ft for 10 minutes and return, total trip time around 30 mins. In a Seneca or 310 thats about £150. Daft idea but interesting job to talk about at parties... "you'll never guess who I had in the back of my plane last week...."