I have spent a bit of time on Freestompboxes and DIYstompboxes - and what that's taught me is that there is some snakeoil - people for instance taking a common circuit and then releasing it with a few mods that someone on a forum developed.
Then you have people who take something and then do the R&D to create their own variant - that might or might not have a merit as it's own thing... but it's subjective. Sometimes it's a variant on something, but often it becomes its whole new thing with features that people want for some specific need.
And then you have some people who create products which have been properly engineered, or with a sole pursuit to some certain level of specific excellence, that with all the DIY skills in the world you wouldn't have a chance of getting near. Or other times is just good, and gets a reputation for being reliably good in a mix, and people buy into that.
Add to that low supply production and it's easy to see how lack of supply leads to high prices on things - I'm not sure that's always hype or snake oil, and for me it really depends on the circuit we're discussing. As @admiralchew says above 3leaf stuff works, and does what it does really well - and then people want that.
Importantly no one is forcing you to buy or want anything, and quality cheaper options exist