I clicked on this thread thinking I would get a glimpse into how "those crazy people who don't like to travel" think, but I see more of myself here than I expected.
Like probably a lot of people, I spent years wanting to travel but not having the time or money to do so. Then I had both the time and the money, so I went all over the world. I loved it, and there are still parts of the world I want to see someday... but now I find myself less inclined to travel, mostly due to all of the annoyances mentioned by several others above. I do think I was trying to escape my stressful job, and trying to catch up on enjoying life after spending a lot of years in school and working too hard, by taking exciting vacations. (I still work, but not as much, and on my own terms.)
It's true, at least for me, that the better you make your day-to-day life, the less you have that burning desire to travel all the time. I love my home, the surrounding area, my family, and my own home-cooked food.
I don't know about other countries, but Americans tend to take our own beautiful country for granted. I used to work in Page, Arizona, and I saw busloads of foreign tourists every day, heading for the beautiful lake, rock formations, canyons, etc. But mention Page or Lake Powell to someone who lives in Phoenix (5 hours away, in the same state), and you get a blank stare. Even my own husband, who has lived in Arizona for 30 years, has never seen the Grand Canyon. :-o (But he's been to Japan, Iceland, Central America, Europe, etc.)