It's a pretty easy equation--do you make enough money through Google Shopping that it makes up for any potential losses from others stealing your image (which you can of course still go after legally)?
Not happy with NSA collecting dragnet surveillance on you? It's a pretty easy equation. Renounce your citizenship.
Neighbor making too much noise at night? It's a pretty easy equation. Move out (or kill them?)
Why can't someone that's party to a relationship make a complaint about an aspect of that relationship?
The answer isn't to stop using Google Shopping, and the answer isn't to 'put up or shut up'. I would hope that someone at Google Shopping might be able to figure out a resolution with OP that is the best for everyone involved - i.e. doesn't break google's TOS, and doesn't leave OP paying to produce high-quality photos that his competition will steal.
In other words, a cry for Google to change the policy to minimize the problem rather than just abandoning Google Shopping.