I don't have a suit right now, but I miss them. I don't need a suit at the moment, but having one on hand sure comes in handy.
I always make a point to dry clean both pieces at the same time, and have to say that I agree with you dianthus in that you can get a lot of use/versatility from a suit - the jacket can be worn with other outfits, same with the pants and/or skirt.
My suits have even served as a last-minute 'formal' outfit when I didn't have a fancy gown - and they dress up quite well.
I slimmed down out of my last suit, and haven't yet gotten around to replacing it. My lifestyle at the moment doesn't really require a suit, but I have to be honest - having one or two on hand, even if you don't really need them, has definitely helped in those situations where you need to be a bit dressed up.
Even if you don't need a suit for work/business purposes, it will still serve as a wonderful addition to one's wardrobe.
A few non-corporate examples:
#1 - the first time I went on a cruise, there were three formal nights and I just didn't have that many formal/party dresses - I took a suit, and wore it with a silk shell and threw on some pearls. Had my hair done at the salon on the ship and felt great.
#2 - sudden funeral - didn't have quite the appropriate outfit, but a suit worked well. Add a simple black or white blouse and it's workable.
#3 - business dinner with my husband - had to be dressed up, but once again, didn't have quite the right dress or outfit - a suit really came in handy - this time it was an eggplant sleeveless wrap top under the jacket and pants, some nice shoes and simple pearl stud earrings - I was good to go.
#4 - a dressed-up engagement party - thew on the pinstripe suit pants, black cashmere sweater, a 'statement' necklace, some pretty shoes and it worked. Very comfortable!
Just some food for thought - you don't have to "need" a suit to appreciate having a suit or two in your wardrobe.