Even if you take great care of your skin at home, getting facials regularly is a good way to keep up with your skincare routine. They're sort of like a reset button for your skin. Facials are really relaxing, and with the extra treatments that are offered (like microdermabrasion and extractions), they can actually help make your at-home skincare more effective.
If you're committing to getting facials every month, consider getting a membership at a skincare spa.