Do Photographers really need Photoshop?
Good images sell. If you're not using professional Photoshop services even if you're familiar with Photoshop you might not be doing your pictures justice. Good images get shared and they get referrals so you owe it to your business to give the best images possible. Sellable images, graphics, and making your own marketing images are all possible using Photoshop, so you don't even need to hire a graphic designer for that holiday banner, or that mini-shoot promotion flier.
Good isn't Great