I worked in the same place for 3.75 years, and for about the second half of that period I saw more regulars. It's difficult to say about busyness because I did less bookings when my civvy job was more demanding, but if I had to say, my guess staying in one place is no worse than moving around/touring (and of course, you can do a bit of both). The other thing is whether you prefer new clients - I found it less stressful when a higher proportion of my bookings was with regs.