I got my table saw second hand several years ago. It came with a general purpose blade which has served me well without cleaning or sharpening until recently. I made what I now realize is a mistake in trying to rip some primed lumber. The blade now binds and the saw stalls, even after cleaning it carefully. Did I ruin the blade? I can't really complain if the time has come to replace it. Are sharpening services economical? I can buy a new blade for $10-30 and I imagine sharpening isn't cheap.
It's probably more economical to replace blades than sharpen them in your case. Sending blades out to be sharpened makes more sense for higher cost blades. Forrest's, for example, start around $100 so paying $30 to have them sharpened is quite a big savings over replacement. High quality melamine blades and stacked dados are even further into nosebleed pricing.