Not everyone immediately jumps onto the "gotta have the latest thing 'cause it's SOOO much better" wagon. As has been stated above I, too, first watched TOS on grainy b&w then colour (with grain) then VHS and then remastered onto DVD in the clamshell sets. I bought my Blu-Ray player about a year and some ago, but did not see the need to immediately buy TOS on BD because there were other things of priority. I have since bought films on BD, but not in replacement of anything I already have.
The gain in resolution ans sound isn't sufficiently great to justify the expense of buying something I already own and am satisfied with. The improvement of DVD over VHS was startling. It is not as startling going from DVD to BD.