you mean you'd buy a plotter? Forget it , nobody will buy one colour stickers.
If you're getting a digital printer, forget it. My dad's had one for years and has never been able to perfectly calibrate the colours. The machine itself was $80 000 and he's spent at least an additional $20 000 in inks, computers and material and now he's given up on it. It sits lifeless in his shop.
So, no, it's not worth it. Competition out there is super tight already.