> You are also sitting in half a dozen other people's chairs taking up space

I'm paying the rates they advertise and staying within the time limits they advertise. If they don't like it, they can change their limits or raise their rates

> The 5 minute limit has to be negotiated by all chair owners

It is. If my payment didn't abide by their advertised limits I couldn't use them in my route.

> Also, if you sit in the chair too long a portal to the underworld opens up

I think you mean mean if I stay in the chair for their advertised limit, a portal to the underworld opens up. And if that's the case they should obviously lower their limit. Don't tell me I can stay for five minutes if that destroys your business