Using a vacuum is foolish... it most certainly does cause static to build and it can completely take out the PC in one lil zap. I was a PC maintenace guy for 5 years, and have been building PC's since i was 13, so that's about 17 years now... Can you do it 100 times and get away with it? Sure. Wait till 101 when you fry the Northbridge and you're dropping $300+ for a new motherboard. Will really make you wish you used a $2.99 can of air...
As far as connections dropping, I'm a network software developer now... and lemme tell you WoW amazes me... I got a rash of them over the Thurs night- Saturday period this Thanksgiving weekend... I would guess that a combination of the rolling patches, plus above average use was likely the guilty party. A few times when I was sure I was about to drop, everything 'happened' all at once, 3 spells went off, the raptor i was fighting died, and then I got 3 messages about my target being dead... this went on for almost 2 hours...