The way I stopped wanting to bring everything home was to build one really good system.
That is where I am at right now--I'll look at a listing and see something interesting, but now I stop myself because it would not fit in my high-end system, and I don't need anything else to build a second or third system. My last two CL purchases were upgrades for me. A pair of Vandersteens, sold dirt cheap because the family was moving within a couple of days and needed them gone. And the C-J Premier 11, sold at a deep discount because the owner needed money for medical bills.
Another contributing factor is that I absolutely despise selling audio gear (or anything else for that matter) on Craig's List or ebay. I don't have the right personality to deal with tire kickers and lowballers.
I just don't have the patience for it anymore myself. With CL, all I've had is harassment. With eBay and Amazon, sellers claim the item is "garbage" just so they can send it back due to buyer's remorse. Or an idiot buyer from Audiogon who likely ruined a $700 item himself, and claims I was defrauding him. Thing is, I don't now what to do with all of this stuff I have. It's not a hoard, but is 35 years of buying stuff for my own use. And I could use the money for my next system upgrade. Some I don't really want to part with, but I really need the space also.
It is easier to walk away these days because I never see anything.
Of the thrift stores I have stopped at here, I have never seen anything I would want in my house. Really cheap low-end stereo gear (Soundesign, anyone?), old table radios that are stained and worn, or badly-beaten mass market gear like Sony, Technics, etc. Best I ever saw was a Philips CD recorder...yet one of the two drives was not working.
But on the other hand, get me away from Audiogon, US Audio Mart, etc. as I start seeking upgrades I really have no business buying.