@Luna Unless you do a ton of weird crafting or have a lot of little plastic car dashboard/console pieces or appliance nobs and buttons you're not going to save money with it or profit. For most people that have one it's a hobby and not the tool of a profession. When you get it dialed in it's tons of fun.
It also opens possibilities beyond printed plastic. You can easily print plastic things, finish them as desired. Then, you make a silicone mold and you can cast resins, chocolate, ice, anything not high-temp. If you're bout-it bout-it you can do sand-casting to make actual metal parts. I have a close friend who's collected pewter dragons since age 4 and I aspire to make some custom ones if I can ever get some 3D models I like for the purpose.
If anyone takes the plunge let me know. Your first enemy will be your longtime foe: First Layer Adhesion. I can save you some agony here.