Alan,
You're totally correct about the cost of traveling. I travel at the Lonely Planet (guide books) 'budget' level, have a private room with bath almost every night, eat good food three (or more
) times per day, see everything that I want to see.
The cost? Generally less than what I would have spent at home for food and gas. I can get to the furthest places, say SF to India or Nepal for around $1,200. I just budget $100 per month for my big annual ticket. Lots of people spend more than that on golf, fishing, or other hobbies.
I used to have a 30' sailboat. I spent more on it in 2-3 months than I spend for a 2-3 month trip. Transportation included. It's all about priorities.