Thing is vac formers are dead simple to DIY. Like REALLY dead simple. The trickiest thing about them is the heat source, and you can get away with using a kitchen oven for that if you're mindful of not going over-temperature for a given plastic.
If someone was looking to spend $300 on a vac former, they could build a huge machine capable of doing multi-square foot sheets at a time for that. For less than half that you could build a tabletop setup the size of what's in that kickstarter, but way more powerful and versatile.
Moreover, if someone came to me with 300 bucks today asking my advice on vac formers, I'd just tell them to spend that on a 3D printer instead. Vac formers have their uses, but on a hobby level, at least 3/4 of those uses would be better served by a 3D printer these days, and the printer will have lots of other uses as well.
