Not quite. It's just a broken tracking system. I guess you could do this trick to make some poor blogger think he just got 723459288 new subscribers overnight, but you can't actually cause him to have that many.
Exactly, and that's why they have to fix it. We talk about numbers here, which is a key indicator for many to see how popular a website is; We brought this to light so Google/Feedburner will finally address it
And what, exactly, do you want FeedBurner to do? They're just using the number NetVibes gives them and I doubt NetVibes is going to give them the ability to inspect user accounts to check for dupe subscriptions. So unless your solution for FeedBurner is "don't count NetVibes (or other aggregators that report inaccurately)", there's nothing for them to do.
Oh, be creative. Just off the top of my head: Feedburner could separate out aggregator reported counts, or show two numbers, one with aggregators and one without.
Or boost your own numbers to get more followers. More followers leads to more followers, which leads to anger, which leads to hate which leads to suffering...