How's that old adage go... "You don't pay'em to sleep with you, you pay'em to leave when you're done."
They both cost you, but an SO is like a mortgage the never seems to go away, and doesn't really get you anything for YEARS... While the provider is instant gratification with none of the hassles.
You can have variety with providers....blonde this week....brunette next week. Also, more likely to get a BBBJNQNS, Greek, etc with a provider! You pay for it either way, might as well have a choice in what you want that day.
An old friend said "better to rent the pussy by the hour". Good advice!