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Looking at the game list here at MMORPG.com, there are 598 listed. Some are not released yet, I am sure some small Indy MMOs are missing and some MMOs have closed their doors. For numbers sake, let's say 600 games (makes for easy percentage calculations).
I know many posters have played quite a few and with the F2P MMOs put out today, many are making it easier to play many MMOs.
Giving your best guesstimate, How many of the MMOs listed have you played or tried out?
For the purpose of the poll percentages:
If you've played a beta (closed or open) and the game has not released yet, count it.
If you've played an alpha and the game has not released yet, count it.
If the game has closed down, count it.
Since the actual number of games is not exact (and you've played over 540 MMOs) you get to say, "I've played 100%!"
Personally the only modern MMORPG trend that annoys me is the idea that MMOs need to be designed in a way to attract people who don't actually like MMOs. Which to me makes about as much sense as someone trying to figure out a way to get vegetarians to eat at their steakhouse.