It seems unlikely that the company will be successful, and I mean no offense to you personally.

$50k per adult actually seems like an extremely low price for what is offered. The system must have its own power supply, plumbing, communications means, ventilation, water purification, on-site engineers and repairmen, etc. I'm highly skeptical you can make such a system for $50k per adult, and I'm highly skeptical that such a system will work properly when it matters. Plus, there is no surefire way of testing the system.

Meanwhile, $50k is a lot of money to pay for something that will likely never have any use in a person's lifetime. So, the company must market to people who are rich (but not too rich), not too bright (or on drugs) and paranoid. The target customers can't be too rich because the super wealthy can hire their own engineers to make their own. Also, the target customers can't be too bright because smart people will question the hell out this thing, and they'll discover flaws. Basically, I think the target market is too small for the company to make a profit, unless this whole thing is a scam...

Off topic, if a 50-megaton bomb hit close enough to me such that I would need one of these shelters, then I think I would be ready to meet my maker. Being vaporized by an initial blast seems like a peaceful way to go out.