Exact same thought

But disposable things are bad, I wish every professional painters have this. In my experience painters just order you to buy a new brush and leave it for you.

It’s wouldn’t ever be, and a roller is a cheap, can get a dozen for $10-20

Painters just leave the rollers sitting in a bucket of paint thinner and use one of these for $20 to spin it dry.

But also, you can’t just reuse a roller for any other color or paint, they’re cheap enough that you use brand new and remove any complications for a new job. But it’s fine reuse yesterdays for the same client.

As a private consumer, a lot. As a professional, not so much.

Going with an average price of around 13 bucks for a professional roller from a well-respected name brand (sampled from a trade supplier across their online shop offering, containing rollers starting at $5 to $26) and looking at the price of the Roller Blaster Paint Roller Cleaner of around $1200, you'd arrive at something like 92 rollers.

This is not a perfect calculation though, as rollers for common colors (e. g. white) can typically be cleaned superficially, wrapped in a roller cover and then stored away, plus we're not factoring in the time it takes to properly clean a roller vs. charging it as a consumable to the customer - if a painter does an hour of roller cleaning, that time (and consequently money) has to come from somewhere.

You can easily use more than 100 rollers / year as a professional painter, so I'd say the time savings and the fact that high quality and specialty rollers can be saved and reused (not even talking about the environmental considerations) would be worth it - if anyone would care and not simply treat the rollers as a disposable item.

I wonder how much time cleaning the machine and disposal of the waste will be, though. Plus, I think for the average hobby gamer, a kit with identical functionality could be DIYed rather easily. Probably only worth it if you just bought a house though.