Honestly, unless you have the absolute best of the best and are raking in top dollar stud fees, stallions will not even come close to paying for themselves. A mare owner literally has hundreds of studs to choose from these days, and unless yours are exceptional in both conformation and proven ability, it isn't worth the extra work to try to stand them. I would geld all of them as well, none are what I'd consider top breeding quality horses. They will still run barrels just as well as geldings.
As far as they themselves go, without having true confo pictures and the fact that none of them are done growing except the mare, I don't see any glaring faults that would make me run the other direction. Just average decent horses with flashy colors.
"Keep a leg on each side and your mind in the middle"