Backing up what Lazy G posted...
I've only sold 1 halfblood Lowline steer at a sale barn, but anytime you gross almost $750 on a calf that only ate soy hulls for 45-60 days (the only other feed was pasture, hay, mineral, salt, & milk), was under a year of age, was born unassisted out of a 1st calf heifer who moved up over a month when calving the next year, I think that your doing OK.
IMHO, I've done a HORRIBLE job marketing during the last 8-9 months, mostly due to being extremely busy with other things. I only have 2 bulls left for sale, two of my best 3/4 bloods. Everything else is sold & all were either sold sight unseen or the buyers drove here to see them. All of the buyers were commercial guys who already had established cattle herds. 1 has 300 head in southern IL. I turned away a buyer from southeastern IN who recently went to Nebraska & bought 50 + percentage Lowline females, 1 fullblood cow & some bulls. 2 customers of mine, live in the same county & that helped encouraged him to dive in head first. I've got a commercial guy in Texas who previously bought a bull from a customer of mine, who is looking for percentage Lowline females. I've lost sales to several other commercial people, because I didn't get pics taken, etc. Anyway, there are a whole lot more percentage Lowline cattle running around than there used to be & the interest is not slowing down at all. In fact, it may be increasing. Why? Because people are finding out from friends, neighbors, acquaintances, etc. that percentage Lowline cattle will work in a commercial setting. I think that many would be shocked to learn just how many commercial breeders are now using Lowline bulls on their heifers.
With that said, if I was a commercial breeder, I'd probably want to produce no higher than a 1/2 blood Lowline. 1/4 - 1/2 is probabaly the optimal level. If you are breeding to potential "occasional cow killers", I'd probably want 1/4 blood mature cows. JMHO.