I suffered thru years and years of mediocrity and terrible-ness as a Bama fan, losing to UT almost every year, having coaches leave or get fired (or not even coach a game), Albert Means, etc..
Alabama was far from where they are now when I started pulling for them.

Spurs because my brother was stationed in San Antiono and the Spurs were the first NBA team I saw live. I was a huge David Robinson fan, then Timmy D. The Spurs had a great run, but fans never rushed on the Spur bandwagon because of the style of play and the lack of big, flamboyant personalities.

I pull for Atlanta because my mom used to watch the Braves all the time, so naturally I fell into the Braves crowd. Been pretty lucky with them in terms of playoff appearances, but do you really want to be a Braves fan? You have no idea how horrible it is for your team to make the playoffs every year and only win 1 WS. Its much harder when your team loses in the NLCS on a walkoff HR or the WS after being up 2-1.

Im a Niners fan too, so I've seen my fair share of terrible teams.

In my lifetime, my teams have won 4 NBA titles, 1 NCAA football title (I was still really young in 92), 1 Super Bowl and 1 World Series.

I have been very fortunate, I cannot complain. But I don't see how I could possibly be classified as a bandwagon fan, all of my teams won titles after I began rooting for them.