the difference is you are amortizing your costs over one set, they will over thousands. It’s not really that big a deal for me. Other options will be available soon.I look at something like this and immediately think "Man, that's high."
Then I immediately think "I can make them cheaper than that."
So you grab some cardboard, make a template.
Procure some steel.
Break out the plasma.
Clean up the edges with a grinder.
Paint (and bought primer, sandpaper, paint, grinding pads, plasma consumables)
Procure stainless fasteners or paint steel ones so they don't rust.
Then I find I have something that works well, only spent about $120, and used 4 hours of my Saturday.
All this to say sometimes it's better to just pay and buy and sometimes it makes sense to make it yourself.
At $349 I'll probably just buy them and spend that 4 hours making money on something else or fishing.