Actually, Plasma technology has moved to where it no longer burns in. Additionally, it has a wider viewing angle, color gamut, faster response and lower input lag.
And since gamers typically need more sun, the only disadvantage you're really bringing into this is the extra power consumption, which, yeah, can be more than double an LCD. Can be something like a third of the price though. Just... no one ever buys them because the LED TV's sound "newer", which is a shame, because Plasma is awesome.
That said, I haven't heard of a plasma screen under 42", so...