I'm a sentimental fool. Mea Culpa.....no, Maxi Mea Culpa..!! I hoard things that mean something to me. I've got every Christmas and birthday card Amanda and - more recently - Megan have ever given me. I've even kept an old dress from my In-The-Closet years when I still wore dresses, because it holds memories of certain occasions. I still have all my teenage diaries (well locked away from possible prying eyes) and more photos taken at parties, on school trips, or just plain messing about with friends, than you can waggle a well-worn stick at.
Practical stuff I have no time for keeping. If it's of no further use in a functional sense it goes to the recycling centre.
I do, however, have some things that might be worth a few bob in a financial sense. Stuff that nowadays is called 'memorabilia' or 'collectibles'. F'rinstance: My mint-condition set of Nat West ceramic pigs, still with the original logo'd rubber stoppers in the bottom. My programme from when I was taken to see Cats on my birthday and a kind theatre staff member took it backstage after the show to get it signed. The autographs include cast members including Wayne Sleep (Quaxo), Seeta Indrani (Cassandra) and Myra Sands (Jennyanydots). When I first started using social media, I used "Jennyanydots" as a screen name. I can't think why I still don't, actually.
I have the full set of Roland Rat soft toys from the 1980s, although they're in "Significantly Much Played With" condition so not of great commercial value. But I still love Kevin the Gerbil.
I now collect soft toy Meerkats... a promotion by a comparison website here. I've nearly got them all. Meg wants to get them out and play with them, but I keep them in their original boxes and well out of the reach of little hands. They'll be hers one day and whether she converts them into cash or if she's inherited my sentimentality gene and keeps them will be up to her.
Collectibles are worth money, but memories are something money can't buy.