Quoting Gale Winthrope
I have seen it, and I think it is amazing. But I do not have money to spend on individual pieces. I prefer to spend it on large lb lots that give me a good variety of pieces. Most of the ones I happen across have older pieces, (2004 and back) so most of my collection is those pieces. I try to get one of those at garage sales or eBay once every two to four months.
I use a trick to get a lot of pieces at once, once you get into a store you can browse through pieces and add them to your cart ,Ive been able to make full sets just by buying all the pieces to them, thats how I make all my MOCs.