Hey, I'm with LFD, I designed the bars.
They're 11 Gauge steel, cut, bent, welded, and powder coated.
Like it's been said, the height is important for carrying larger objects and clearing the factory rails, as well as leaving enough room underneath for wrench access.
One thing you didn't factor into the cost is also the machinery to make the parts. You're not just paying for the material and labor, but there's also $700,000 of fiber laser and $300,000 of press brake, not counting their operational cost, that have to be factored in, as well as dealer margins. Machinery and machine time isn't cheap.
When you look at the actual cost, not just raw material, we felt $80 per bar was more than fair, but to each his own.
Our bars weight 5 pounds each currently. We're looking at aluminum options now for our larger racks, and that may trickle down as an option for bars too in the future.
And it's my grey 4R on the website, not [MENTION=113833]e60ral[/MENTION].
Feel free to ask more questions. I do like your home made approach, more options are always better for everyone in the end!