I am pretty cheap in general, but I really like bags, especially well thought-out carry-on bags. I tend to look once in a while, including on eBay and Craigslist, for used, well-known and reviewed bags (just got the Patagonia MLC from a couple of years ago for $75 total on eBay), especially because they usually come with lifetime warranty. This way, even used bags that might be damaged can be repaired or replaced.
So, now I have an Osprey Porter 46, which is ok, and which I got on sale a couple of years go from REI, and this MLC (plus other, cheaper bags here and there). I don't really need any, but I might sell a few here and there.