If you do a bit of knitting that is obviously an amateur's attempt, people will say "wow, so cool that you can knit". When you work hard and get better at knitting and you produce stuff that is so good that it's commercial-product quality, people will say "what's the point in spending all that time and effort when you can just buy one?". Only when you become so good at knitting that your output is of a quality that is not generally available commercially do people find it interesting again.
Replace "knitting" with anything you like: programming, painting, woodworking, welding, electronics, 3d printing, pottery, basket-weaving, card tricks, ...
People are interested in things that seem cute and homemade. They're interested in things that are better than anything they've seen before. They're not generally interested in the mediocre middle, even when it has been created by 1 person who spent a lot of time and tried hard, rather than by a faceless megacorporation.
EDIT: I think I did the faceless megacorporations a disservice there. Faceless megacorporations also make high quality products through the hard work of their employees, they just do such a great job, and they mass-produce so efficiently, that the products end up inconceivably cheap and we take them for granted.