So how much did your wife and daughter pay per "brush of hair" or "wearing of outfit"?
I know its hard to part....but it might be a good idea...so you quit spending money on so many bikes. You can only ride one at a time. And at 1800 miles....you aren't even doing "major riding" at that.
I wouldn't tell them at garage sales, but maybe there is a bike shop that sells on consignment. I know one in my area that does. Just a thought.