I buy knives for both collecting and use. Some of my knives are works of art that could be carried, but I won't because they are art. Others are simply limited editions with different blade or handle material and those are available for the right occasion.

My RSK's are all users. I had two of the RSK in M2, carried one, kept the second as back-up. Both retired now that the M4 version is out. One of my EDC knives is an RSK in S30V -- no collectible there.