Just commenting on how MSABing isn't as speed dependent as AAing.
As EC makes ABing in general faster, you need to be extra careful with your times when buying from the main shops since anything below 1200 ms is dangerous.
Buying a draik MP from potions in <500 ms is a death wish whereas buying a draik MP from the Attic in less then 500 ms is what you should be aiming for.
It is just as "speed dependent": you still need to be faster than everyone else going for the item you want. You just also need to bear in mind that there are limits to consider. Just because you are not trying to minimise a factor, does not make it unimportant. Or even less important.
Do you know why an EC2 machine may have a faster buy time than a home machine? Because of location, and because of their connection speed. Both of these things are a factor when buying on home machines too - acknowledging them and accounting for them lowers your risk however you happen to be ABing.
When used properly, virtual machines are absolutely not any more risky. Improper users who remain voluntarily ignorant should be encouraged to get themselves frozen anyway.