Priced precision lathes lately, lathes that can do threading as fine as your $45 clone? Cough up the money for one and the electrical work to power it, then tool up to produce a simple tube mod, pray you know what you are doing, and figure out just how long it takes to carve a tube mod, or simple atty.
Price components like glass, O rings, SS bar stock, what ever your device might need, world wide shipping, your electric costs.
Now figure out just how much money your making off of these simple tube mods.
Your likely in the red for years at $150 a pop.
Do you REALLY think it's that difficult? Honestly?
I can assure you it's not.
Take a good look at that gun. The ONLY pieces that were prefabricated were the barrel, internal trigger mechanism, and the screws. Every single bit of the rest of it is hand carved, hand cut, hand engraved, hand inlaid, hand formed, hand polished, and hand finished.
My father was the gunsmith who produced this weapon, and I know several other master gunsmiths as well.
I can assure you that the average competent gunsmith could fabricate the average mech mod in about 15 minutes by hand if you don't include engravings or etchings. And those threads you think are oh-so difficult to produces and require big expensive lathes, I've got a newsflash for you, they had be done by hand with a gunsmiths thread tap in a matter of minutes, and will be gunsmith quality, not the shabby work done by the typical mech mod producer.
And unlike your typical mech mod I can assure you that a mech mod made by the gunsmith will have buttons that work flawlessly, batteries that never rattle, and it will work every time you press the button without fail.
It's not hard. It shouldn't take a long time. Making them by hand in a decent workshop, a single person could easily produce a hundred per day. At $200 per unit that's $20,000 per day income on a material investment of less than $50 and a time investment of only 8 hours. At that profit rate they could easily pay for their entire workshop in the first week and pocket more than $95,000 in pure profits per week after that.
You're paying premium prices for high school level design and machine work. One needs look no further than the common button problems, connector pin problems, voltage drop issues, and fitment issues to know that most producers of original mech mods are simply vapers who happened to have access to a machine shop and figured it was an easy way to make a fast buck. The quality of the vast majority of mechs would be considered rejects by industries that rely on precision design and machine work and yet sell their products for less.