I have a couple of dozen MM cobs and a half dozen artisan cobs by R. Santia. I love the cobs but have a lifetime supply. I'll not buy others with the exceptions of some antique or hand crafted specials that catch my eye.
I have over a half dozen Savinelli and Stanwell pipes - maybe close to a dozen each. They all smoke great, I like the shapes and can be had for reasonable sums. I have enough of these and will only add shapes that whisper come hither to me.
I currently have 5 Neerup/Peder Jeppesens and will likely add more eventually. I love the shapes, finish and uniqueness of these pipes and they smoke really well.
I have a single GBD, W.O. Larsen, Nording, Sasienii's, Comoy, Icarus and others. I will not actively seek to add additional of any of these excepting perhaps the Icarus and Neptune.
I also have a couple of meershaums including a CAO. I don't know if I will add others or not. If I do, it will be high end. I'm not really happy with the draw on the meers nor the stem assembly. They are, however, beautiful.
Pax