Well, luckily these are thermal heads a d not piezo which cost $2-3000 each.
Heads are about $110-130... So it's not TOO big of a cost to replace them. The ink lines may be fine.. If not its not too bad to replace them either. But they're closed off so it should be OK.
It depends if it fits into your business model. They're good for posters, vellum for screens...pretty good for canvas, etc.
You can get some aqeuous compatible vinyl... But it's like 5x the cost of solvent/latex vinyl.
Most of these printers these days sell to home builders who need to print blueprints and drafts, or real estate agents needing to produce a mockup.
They're slow, I don't think the ink is meant for outdoor durability... They have their uses, but they're limited.
It's pretty much a big desktop printer. Mainly for paper printing