I've heard of people doing that, Richard, but I certainly don't hear it often. I tried putting osmocote pellets in five or six different pitchers and at least three of them developed mold (although this could have been unrelated). Also, I don't really like the idea of the pellet sitting against the plant for that long, despite the guarantee that the pellets will not burn the plant. Instead, I have taken to just spraying a little bit of orchid fertilizer into the pitchers when I foliar feed the plants.
That being said, I do add three or four osmocote pellets to the soil of my neps, cephs, and heli. I've only done this once, and will probably do it again in 6 months or so. On top of that, I fertilize the soil with orchid ferts, which I strongly believe is the best way to see dramatic growth. Foliar and pitcher feeding alone doesn't seem to cut it, IMHO.
Oh wow, didn't realize how old the post I responded to actually is.