Whats a hobby/craft that you wouldn't expect that has an incredibly high ceiling either monetarily or in sheer skill?
For example, I'm sure the average joe doesn't know just how expensive calligraphy pens can be, or how deep the rabbit hole goes on video game speedruns.
If you have a printer set up and ready to go, it certainly can be. But for me to get a printer and all the fixings (printer, cure/wash station, resin, tent and ventilation for fumes) I was out about 700 Cad. And then you gotta get stls, some are easy others are way harder. Some of those are free and some are paid. And then I myself am paying for lychee pro, so that's around a Netflix sub down the drain. Once that's all clear there is the insane time investment. I can easily spend 30-60 min processing a job and prepping the printer for the next print. Finding, prepping an stl to print if everything is good can take as short as an hour, but can take much longer if things are hard to find, or if it's a complex object to support. And then if you fail that print, all that time and resin (not too terrible, my large prints are like 5 bucks, small minis are under a dollar) is wasted.
After all that, there is still things I plan to buy. I lack the patience to try printing void dragon c'tan, and there's only one source that I could hope to buy a decent imotekh stl, and it'd be more expensive than buying the model (I regret buying it. That is the first and last time I ever get a finecast model).
For me the fun is in the journey not the product. I've had a lot of fun printing my necrons. I don't plan on playing in anything official, just friends so that angle isn't an issue. I went into it wanting to take up 3d printing as its own hobby and I do not regret going this route, but building a single 2k army like I plan to is not worth it. Past that I imagine the savings will roll in, but I don't really care for another army. Ethics wise I'm happy to vote with my wallet by diverting money to printing VS. paying for overpriced models.
It is a bit more complicated than that. Basically, people you play with won't care so long as you've painted it to a reasonable standard and there isn't some massive size difference that'd give some notable advantage or disadvantage compared to official minis. The same is true of official ones where people are picky about unpainted plastic but its likely more a thing with printed ones. Independent game stores also won't really give a shit since you're likely buying paints and stuff from them anyway.
GW stores are the ones that will have a problem with it, along with tournaments they host. I have heard stories of people getting shit for using forgeworld stuff (which is GW's speciality site basically, they sell the really big models and some more niche like, regiment-specific stuff) in stores because it isn't something the stores themselves will specifically sell. This is because of corporate policy though, no one wants to lose their job.