Well, like those before me, I'm not about to judge you either. If you're comfortable with it I don't see any problem.
It's a job--a way to make a living. There's a demand and you're (part of) the supply.
Do I feel it "devalues the relationship between a Dominant and submissive?" Does general prostitution devalues a relationship between lovers? Of course not--one's a paid by the hour professional service the other's an intimate and emotional relationship/commitment.