Because the old tier could not handle sustained 20Mb service which is the reason they resort to gimmicks like powerboost.
Boot or "powerboost" as you call it was not really a gimick like you said.. when I was having issues with the non boot line It was hard to get up to 15mbps speeds switching to boost moves the modem over to another frequency less people might not have that so less people clogging it up..
Now with Ultra it's the same thing as with boost but with newer equipment and far less users. -- It's NOT Ni-kon It's NE-KON!
I'm saying gimmick in that a cable company can use it to provide 20-30Mb service without actually providing 20-30Mb service. And at least with my cable provider, Cox, more and more advertising shows the Powerboost speed as the tier speed and only on the actual order pages on their website do you see what the true tier speeds are.
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