~50%. Our group has three rotating DMs (sort of, I'm behind the screen more often than not), with six frequent gamers and two occasional gamers.
In my game:
Rogue/Fighter/Shadowdancer
Fighter/Paladin
Monk
Rogue (taking Thief-Acrobat next level)
Rogue
occasional Wizard (but plays a different character about every other session)
occasional Barbarian
...with most characters around 10th level. And yes, there's a booming cure-wounds potion economy that follows them wherever they go.
In the other two games, I play a fighter/bard and an evoker. The evoker's an 18-strength, 18-con spiked-chain-wielding half-orc, so he plays like a fighter/wizard at his low level. (No, I didn't roll that; the DM gave everyone a free 18 for the heck of it, and I put my best (16) stat roll in strength.)
I've got a rogue/paladin (saw the light
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
) as a backup character for either game.
In the game where I'm the Fighter/Bard, there's a druid, a fighter/cleric, a ranger, and a paladin. In my game, nobody heals (except the couple points of lay-on-hands from the Paladin.) In this game, everybody heals. Rather bizarre.