The assumption I started from was that such an experience has a potential of improving participants' overall productivity and self-perception of mental wellbeing and focus during and post-experience. The key was to measure and improve those metrics while refining the experience itself. I have managed to successfully complete a 3-month pilot with clear indication that this is doable and can be beneficial. This was a very strong selling point.
B2C path didn't graduate due to unaffordable expected end-consumer costs. I ended up focusing on 50-500-employee companies with the intention of building these rooms according to spec for monthly membership fee from their HR budgets. COVID hit and there were no offices or HR budget allocations anymore. For B2B, a catchphrase that worked for me and caught everyone's attention was that "happy hours" cost them hours and bring no happiness.
I believe this is a necessity in today's growing pace of things. Good luck!