The big markets haven't changed much. NY, Boston, Chicago, and LA still have all the money. An upstart team is the LAA Angels...unless they changed their name again. Their ownership has been spending.
Small market teams are Pittsburgh, Cincinnati

, Florida, Cleveland, Oakland, etc. They have to get by on developing talent and having the stars align for them. If they are close to winning, they will spend for one year to see if they get over the hump.
The only fanbase I know is the Reds. They have a loyal following....at least by me.
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"People ask me what I do in winter when there's no baseball. I'll tell you what I do. I stare out the window and wait for spring." Rogers Hornsby
"I'm just like everybody else. I have two arms, two legs and four-thousand hits." Pete Rose