No idea what a "bora" moderator is, but this thread seems to have gone off track regarding pricing.
Many of us do not have the skill or equipment to make their own moderator, nor do they desire to try. I'm one of those - I would prefer to buy a known tested and reviewed model. In addition, something which not been mentioned yet, is aesthetics and curb appeal. I don't want an ugly Coke can hanging off my $1500 rifle. If I can buy something that looks good and performs well that adds to the utility value of the moderator then why not?
I also don't think you are giving the designers of these moderators much credit if you are likening a garage tin can to a CNC machined, HA anodized production model.
The Huggett Astille costs around $150. It's damn expensive, but it's the best moderator I've ever used. And it looks really nice. The tolerances are very tight and the parts fit precisely with very fine threading on the pieces.
Is it worth $150? Probably not fully, but it's definitely worth more than $20 in plumbing parts and hair curlers.