It would depend on what it is. I dont' really do the purging thing because every time I get rid of stuff, I find a way I could have used it myself. If I was getting rid of machines or something with some value, I would definitely use eBay. If it was routine small stuff, it wouldn't be worth it.
I sold tons of collectibles for my mom on eBay. It's a great resource for specialty items, buying or selling