As someone who is a professional QA, it's testing and re-testing issues and doing things like black box testing, regression testing, integration testing, functional testing, and other things that are simply not just "playing with the tool/game", or ooohing and ahhing at the "new shinies" or using it regularly. In doing so you keep asking about how things work, why they work certain ways and if they match the Acceptance Criteria laid out for the change, enchantment, upgrade, new feature/function.
If I had a 25th hour of the day I would help out more with this testing.
Unfortunately I don't. And after spending 40-60 hours a week, I just want to hop on COH and just play.
More power to those in the internal, pre-public testing test who are squashing the king kong sized bugs before they get to us.