It's 3000 GP just for the material components, plus another 400 to pay the caster. At one gold piece a day (the amount a skilled artisan earns) it'd take 11.5 years to earn a clone with a poor lifestyle (2 SP per day).
So you're living a poor lifestyle for basically half your professional life, just to earn the ability to repeat your professional life and spend another 11.5 years of it earning the ability to repeat your professional life just to spend 11.5 years of it earning the ability to... you get the idea. You'd also need to find a caster capable of casting an 8th level spell, which is rare.
Possible? Yes. Popular? I doubt it.
I remember offhand it being 50 GP per level of the spell you want to cast, though I can't say where in the PHB I read that.