Oh yeah, I own most of the stuff I post, whether I scanned it or not. The few exceptions (which, off the top of my head, are the pre-Denny Question posts, Batman Chronicles #15 and a couple Babs/Dinah scans) are things I'm either actively seeking or saving money to buy. About the only thing I scan consistently is the Super Dictionary, because there's isn't really any alternative.
And I would be tempted to contribute to DCP and frankenstein Wednesday Comics together every week if my scanner wasn't such low quality. It's an HP all-in-one from about three years ago, prolly the cheapest one they had at the time. Before I joined up here, I mostly used it for drawings, and the quality never really shows so much on my rough pencils until I'm trying to trace them in openCanvas at 8x zoom.