Let me start by saying that there is absolutely nothing wrong with buying used curriculum.  As homeschoolers we all need to "save a buck" (or a few hundred of them) where we can.  Most homeschoolers are single-income families that need to be frugal if they are going to make ends meet.

So what I want to address is not the idea of buying used curriculum, but the stated practice of doing so exclusively.  I want to suggest that doing so not become your "modus operandi."  By this I mean to not have it be your "professed" and "set in stone" means of getting your materials to the intended exclusion of never buying anything new. 

I say this only because I have heard some homeschoolers openly state that they never buy anything new; only used; obviously very pleased with themselves for their wise approach.  If everyone adopts this approach, people like us will go out of business.  Now if that's perfectly fine with you, no need to read further. However...

...if you would like to know more "behind the scenes" of the homeschool authors and suppliers that are serving you and making these products available to you, there are three articles right here at my website on this topic that will broaden your "horizons" a bit.    ;-)   They're at the Article Chart in the "Homeschool Resourcefulness and Purchasing" section, which is about three-fourths of the way down the page.  Or you can go directly to them from these links: 

     "Frugal vs. (Downright) Cheap" (by me) 
   
     "Why Don't You Discount?" by Ellyn Davis of Elijah Company
   
     "The Buck Stops Where?" by Donna Heck

Please let me clarify:  The intent of these articles is NOT to put anyone on a "guilt trip" or to make anyone feel bad for needing to be frugal, but rather to give them a broader base of knowledge from which to operate. There is a much bigger picture that most  homeschoolers are not aware of, and really, have no way of being aware of unless someone tells them. I know *I* was totally unaware until I got into the business myself.  

What and where you purchase your curriculum (and any other homeschool-related books) will have a much greater impact on the homeschool market than it would in any other only because of how small this market is.  So these articles are intended only to give you a better understanding of the "bigger picture" which, as a homeschool purchaser (or "consumer") you are automatically a part of.