I don't see major technical or economic problems in producing turnbuckles.
If you see no technical or economic reasons for turnbuckles, why not do it yourself and offer them up to the masses at a reduced rate?
I actually admire Lukasz decision not to produce them. He clearly understands that not everything in business must mean cut throat or nail your competitor to the wall. Thank the lord!
Goodluck to Gaspatch and to Taurus.
Why would Bob from Bob's Buckles wish his competitors well? Because I'm a modeller first and foremost. If my eyelets and cut tube help fellow modellers, then that brings me much happiness. If the day comes when modellers don't want eyelets and cut tube, so be it. I have given good service, the best price possible for a handmade product and a whole lot of pride in seeing my wee bits installed on models all over the world. I'm a happy bunny

The 3D printer will soon be as common as the print printer. When that day comes the whole industry will change and small players like me will be swallowed up and resigned to history. That's life

I'll get off my soapbox now.
Cheers,
Bob Von Taurus-Fanboy