When I started kegging, I cast off all my bottles and vowed never to bottle a whole batch again. However, you have to consider how many serving positions you have. If you have two, you don't really want a Russian Imperial Stout or Barleywine as one of them. Even though I have 5 positions, some beers are just too special to have pouring willy nilly. So, yes, I just recently bottled my Flanders Brown and RIS.
I have 9. One is star san, as I dont feel like getting a different wrench for one post out of 18. So it always has star san, which is really useful.
I am planning on bottling half to all of my wheat beer this summer. I like the carb levels high and I do not have the ability to do that on one of my 4 taps with my current setup. ( would need 2 secondary regs and a longer beer line for the wheat, may do that later). Plus bottle conditioning wheat gets more wheat in suspension during pour, which accentuates the hefe taste I love.
I would like to add 4 more kegs for pipeline/age. I will likely bottle more as my kids grow older. I like having bottles, but time is higher priority right now. I clean a group of kegs at once, then leave them sealed after pumping star san through them. When I am ready to keg, it takes little time (sanitize outside, pop the top and rack in). That allows me to get it done in less intensive chunks of time.
__________________ Insert Name Here Brew Club
Obsessing over: starting a local brewery, CSA produce, my wife, 4 month old and 3.5 year old, my chevy 6.5L diesel Suburban
Reading: The Supper of the Lamb by Robert Capon
Building: gardens, recipes, and trailer mounted smoker/ wood pizza oven