Hi!
I used to work at PetSmart and there is a grooming department there. I know the groomers there did really well. However, if one customer does not like the cut, they tend to go to other more "professional" salons (not saying that PS is not professional or anything). I know the groomers make decent money. If you are looking to make a full time living, I would check into grooming management. Maybe take over a salon?
But yes, there is always a need for a groomer.
Perhaps one near a dog park, which we have several. I know I used to take my dogs up to PS after the dog park because it was so close.
Good luck!