Yes I would, but I might go for just a little bit cheaper than 3k per DC and would offer SC as well, and possibly cheaper deals for buying bulk, every colour, etc. and you could offer packages if your into that.
Packages as in certain colours in a certain quantity for cheaper than buying separately. For example: 1 Blue package (1 SC of Blue, light blue, and cyan wool) for 4k
TBH Wool isn't as popular these days since concrete is usually a nicer texture, and also people like to flex their money. I think you might have better luck selling in smaller quantities, or setting up deals with shops or malls.