I learned a long time ago that I can't afford all the stuff I wanted, so I got creative. I may never afford the silk purse, but I can afford the sow's ear and elbow grease to try and make a silk purse!
I buy used trains. I run conventional 'cause it's cool, and cheap. I buy Marx because it generally costs less than Lionel and others. I also run O-27 instead of "normal" O trains because of price ands space requirements.
If a person is serious about having fun in O-gauge, even a "po' boy" can have fun in this "rich man's" hobby!