In reaction to your a tad defensive post -- one thing to remember is that very few things are actually personal. Those who state how important it is to support those who support us are most likely not really referencing a couple of $13 purchases. Not intending to speak for them, but my take is that their posts more broadly address the dozens of newbies we get here who only think of how cheaply they can buy something rather than how they can grow in the craft and build a career within a community.
There is, of course, nothing wrong with buying used, considering costs, making good deals, etc. These are all part of running a business, as are the further considerations of how one supports and contributes to the community. Too frequently the newbies (and occasionally others) neglect the latter part.
For instance, some of my earlier comments address years of hearing one of the most absurd assumptions around. I probably couldn't count on hands, toes, nose, and penis (twenty-two for those scoring along at home) the amount of times I've heard the unsourced statement that (___fill_in_the_blank___) look similar, and are therefore all made in the same factory, so there is no difference between brands. From guitar strings to VCRs these "experts" proudly proclaim this misleading meme -- often quite militantly. After many years of experience I've learned these statements are most often made without substantiating evidence and lack any degree of understanding in regard to manufacturing contracts, processes, constraints, and specifications. Time and again my experience has borne out that such statements come from ignorance much more often than from knowledge. Yes, Virginia, there are differences -- vive la différence.