When people question the amount of money you spend on trains simply smile and say the boat people spend much more.
I agree with those who try to focus on categories. I got out of Lionel back in the early 1980s and began collecting British Hornby. Then I moved on to Bing and to a lesser degree Bassett Lowke.Next came K Line 15 inch aluminum streamliners pulled by MTH and Williams F-3s. When the prices of Right of Way brass plummeted in the early 2000s I couldn't resist. Now I'm having fun collecting prewar Kibri tinplate stations. Yes, space is a bit of a problem, but along the way I bit the bullet and sold a significant quantity of trains that just didn't have the same fascination they once did. If I hadn't done this, I would really have had a major space problem.
All of my trains are on display either in cabinets, on shelves, or on my layout's sidings. I can't understand why many collectors keep their trains in sealed or almost sealed boxes. In my opinion toy trains are meant to definitely be seen and if at all possible---operated.
Lewrail