I think every time I see a new, flashy chair pop up in FM it takes more and more space. Don't get me wrong, they look beautiful and well designed, but do they need to occupy 10x the size of a character? I'm looking at you mudkipz chair (and other chairs of similar or bigger size).
I think we pretty much have all the chairs we can possibly have, to be honest. I don't see the staff adding anything else in, anytime soon. Some of the chairs themselves are buggy, I'd rather see that worked on instead of adding in more broken chairs to the game. I think donator chairs are included in this, I know a few of those are a bit flashy and huge. If someone's happily willing to spend 20 RP on something like that, might as well just let it be.
It is not required, no, but there are other places you can hang out with people than Free Market, in small chairs.