Nobody is going to beat .com which almost has 118,000,000 regs, and growing, nobody. It's a basic looking at the numbers. I've asked this many times before and not 1 person could give me the extension that could do it. Not sure why some of you keep putting up this no win scenario, it just makes you look silly. Niche extensions by definition can't, so what's left are generics and most to this point suck. The only one that has the possibility of doing any real numbers is .web and even with that, I don't think they ever get past .net.
Not sure what .bank has to do with anything since it's not something you're going to be regging and selling. So if a few use it, so what.
If the conversation was more, some businesses might use some of these here and there, ok. Of course, that's nothing new. Businesses from time to time have used alternate extensions. .com is still going to be far and away the #1 extension, being used, being sold, in demand etc.
Was curious, so I checked
This year so far, 90/100 top sales were .com
http://www.dnjournal.com/ytd-sales-charts.htm
I picked a random year from the past to see what it was, 2008
It was 81/100 .com, so this year is even better than the past
http://www.dnjournal.com/archive/domainsales/2008/ytd-sales-chart-2008.htm