Working in any job doesn't necessarily mean you're good.
And what makes you think that simply being able to screw like a mink means you'd be worth the $$? There are millions upon millions of women out there who can screw like minks -- but there's more to being an SP than that. There are lot of reasons someone might look to pay for service. One reason is because he couldn't get laid otherwise -- and if that's your reason, then maybe it's a good bet to proposition the chick at Food Basics. It might get you somewhere with her that you wouldn't get otherwise.
But the overwhelming majority of men who use SPs would have absolutely no problem getting laid without resorting to prostitution. (Believe me!) They CHOOSE prostitution because it's the best (safest, most practical, most affordable) solution for them. If that's you, then you'd be silly to take your chances on an amateur who, while she might be able to perform as well as a good SP, might not understand the responsibilities and obligations that come along with accepting the $$.
After all, any comely young woman today knows she can become an SP and make way better money than she would at Food Basics. If she hasn't chosen to go that route, then that alone should raise a red flag for you. She's already decided that there's something about this business that doesn't work for her. It might be something that will prevent her from accepting your offer; it might be something that will make you wish for the rest of your life that she hadn't!
Good luck anyway!
..c..