As far as I'm concerned, meeting new clients regularly, and also having repeat encounters with gentlemen with whom I'm building an ongoing dynamic, are both important aspects of variety.
I'm the same way in my civvie/personal sex life. I like to have friends who I can sleep with regularly, NSA. We still build a regular sexual dynamic together, build familiarity, and go deeper with our explorations that we have in the past. But if I only slept with regular friends, I would get bored, so I need to chase those random hookups too when I'm in the right mood... bars, the park, the grocery store... wherever I see a hottie who stirs my attentions!! If I exclusively had random hookups, and no regular sexual partners, that would get a bit superficial and boring too I think.
For me, variety is always key. But I would think something was wrong if I did not have a healthy circle of regulars as a part of that variety. I like to meet new people, but I also like the opportunity to go "deeper" (pun fully intended).
I have to admit, if I had a client who was rich & dedicated enough to see me every week or multiple times per week, I would probably get bored pretty quick. I don't sleep with anyone that regularly and don't enjoy doing so. Once or twice a month, or once every few months, are perfect frequencies for me. Which is part of why I travel so much.