The first couple of 3.0 games I played in almost made it to 20th level.
The first game made it to 17th level, with 3 characters making it the whole way (not mine). The game was designed around one character who was killed almost every session (most of the time because he did something stupid, in fact he would even say "this is probably the stupidest thing I've ever done" each time and, amazingly, it ususally was) and then Raised (or Resurrected), which became a running joke. Once we got the "big reveal" (Luke, I'm your father - seriously) the campaign just kind of petered out (since we killed "Vader" with extreme prejudice, no mamby pamby 'turning him back toward the light').
The other game made it to 16th level, but I believe only the Dwarven Cleric was there for the whole thing. We had made it to 8th level (in a very railroady Monte Hall campaign) when I "guest DMed" an adventure. After almost killing the party (I did get the Drow Barbarian) with a bunch of Kobolds, I was appointed DM by the group and took over the campaign. It was really a train wreck from day one (even my games, since everything was skewed by the +7 to +9 magic weapons the previous DM had handed out - and nobody wanted to get rid of), I'm surprised it lasted as long as it did. I guess, technically, my character "made it" to 16th level also, since he did return to run an adventure that another player guest DMed (in which he gave the new Barbarian a +10 Axe that could burrow through stone at 30'/round - UGHH), but he had taken off a few levels. It ended with a horrendous/comical (really, it was so bad the players started pranking each other) attempt to bring in 2 new PCs not long after that.
Every other campaign (7 of them, not all with the same groups) seems to top out around 7-10th level when it either loses steam or there is a TPK (or usually just a near TPK). The only other campaign was a disaster that limped to 5th level before the inner-party conflict tore it apart (which actually centered around a character with the Merchantile Background feat that gave the party MORE gold than normal).