All copyright does is give you standing to sue if somebody reproduces your work, in whole or in part. To sue "successfully," you need more financial resources than the copier.

The small artist copyright is a red herring. I think the number of small artists who make money from their work is frightfully small. For example, my partner makes some rather nice jewelry that is different from anything out there. We're doing the craft fair circuit to see if she can sell any and if it's worth continuing to make them.

She sells a relatively small number of pieces at each fair. Occasionally it's even enough to cover expenses.

Would copyright help her? No, because we wouldn't have the money to sue. Small copyright violations might be worth a cease and desist. Large copyright violations would have more money than us for the lawsuit. We would need that Goldilocks-sized violation. They are small enough to be responsive to the threat of a lawsuit but big enough that they have enough money that would be worthwhile suing them, i.e. enough to pay our lawyer.