Why would anyone invest thousands of dollars, maybe tens of thousands of dollars, possibly six-figure's worth of money and countless hours of time in little toy electric trains that in the vast majority of cases will depreciate in value and be left to family members who couldn't care less about them when the owner dies? Because it gave the owner joy. Try not to be a crabby old man in the process.
Oh, and what UKAFLYER said too. Thanks.