Okay, so here goes the Why? list.
1. Mainly because there's a lot of socializing going on in Glitch, and how awkward is it for us to be always standing no matter what?
a. Besides, our houses have seats, eg. Alakol 30k/50k houses, and more of which I don't know of have seats 'built into' the background, so if we could have them as interactive objects that'd be cool. One more plus point of having a house.
2. They can be a source of regenerating energy. After all, some of us tend to spend time AFKing, so why not make use of that time? The question of 'that wouldn't be fair' might arise, but then you could reduce the energy generated per minute to say, 1 or 2 then. Make it a very small thing.
3. It looks good. Our characters would look good sitting down, and there could be various design chairs made available. They could even be made subscriber-only or something.
There are tons of reasons why, but hey, I hope this idea sounds good, to TS and to us Glitchies out there. Gone are the days where we have to fall asleep standing up. :D