It's not just "toy trains", (put in quotes as they aren't toys any more). It's old fishing lures, original vw bug parts etc, it's pretty much everything. For some it's nostalgia, others it's "rarity", other things because we know it will fit, (yes, bug ref). As I am sure someone mentioned previously, supply and demand. That and some people are lucky enough to have more $ than brains.
We don't need 1/2 the stuff, (ie crap) we have, it's greed and marketing.
My rant, (what's 2 cents Canadian worth 2 you guys? $0.0075 cents lol).