Yes, "how to get rid of things" is an interesting problem. Sometimes my mom complains about how hard it is to get rid of things (physically--she wants to get rid of them) and I'm like, "I don't get it. Just throw it in the trash." Of course, I have a big dumpster outside my apartment building that I walk by on my way to work every day, and recycling bins in the same place. My mom lives out in the country, with no trash pick-up. Where does the full bag of trash go when it leaves the kitchen? Usually out to their garage. If the weather's not windy and wet, she can burn food and paper trash (which isn't that great, but that's what they do); but non-burnable things, plus recycling, just piles up until she prods my dad enough to take a trunk load of it somewhere--a friendly neighbor with a dumpster or the recycling center in another town, say.
And that's just normal trash. She knows of donation places for clothes, but they're two towns away so she has to collect stuff and plan out when she's going. (And there's always the threat of my dad, the hoarder, going through the pile and taking things back, even if they aren't his!) She has a computer and uses the Internet, but isn't fluent at it by any means; I can't picture her ever selling anything on eBay to get rid of it, or even knowing what Craigslist or Freecycle are (if they're even available in her town). Now granted, I've not used them personally either, but I feel like I could if I needed to, and that I could successfully search the Internet for places to dispose of other things, like electronics or furniture. I think the logistics just seem overwhelming to her--getting someone to come out to her house in the country with a large vehicle and people who can move a piece of furniture and take it away for her, for example. (And that's after convincing my dad to get rid of the furniture in the first place.)
Now I have to say, this doesn't mean my mom passes stuff on to me, which I appreciate. But for someone else, it easily could--"Oh, Sally can get rid of stuff much more easily than I can!" You know, you do a favor for them once, and after that they just keep bringing you stuff to dispose of, without even asking you first. Which is still rude, even if they aren't operating under the pretense that they're giving you a gift.