I have sitters that perch on a little flat area at the bottom of the bowl or bowl and stem, but I have others that have broad flat bottoms that have fairly sturdy footing. A sturdy sitter is especially companionable. You never have to look for a place to prop it up, just any flat surface.
My first pipe bought in the mid-1970's, a Tinder Box St. Ives house pipe, is a bent pot sitter with an unusual vertical saddle stem. I think it is a French pipe, possibly a Chacom, and still looks good and smokes well. It was beginners luck, and I had the intuition to hang onto it through some non-smoking stretches, for example when I quit in solidarity with my late wife in quitting her three pack a day cigarette habit. If you quit, save at least some of your pipes; I saved all of mine that I had at the time. I still have all of those early pipes.