Your does are very important. Always pick strong reliable lines that produce huge 2 year olds. Talk to other farmers, visit them and see what their does are doing. There are does out there that will make 200-250" 2 year olds, and you can get them for a couple hundred dollars. Good does are very affordable now a days.
Without me knowing what your does are doing for you now, I would say if they are not giving you 150" + two year olds, and 200"+ three year olds (when bred to 200" and bigger breeder bucks), then it is going to be tough to even pay to feed them. I have "started over" twice. And probably will again someday. There is a lot to be learned from raising your does, and if they aren't producing, they need "plucked" from the herd promptly. I don't even try to sell my non producers to someone else. If they don't produce what I want, they surely won't produce for someone else and (as harsh as it sounds) they usually get shot right in their pen for meat. I had to do it a couple times last fall unfortunately.
I have made some foolish (or uneducated) purchases before, we all do, but learning from your mistakes is all you can do.
It works both ways. In the past I have even bought does for $100-$300 on W.E that have made some pretty Big Shooters for me.