You can't get around Bloomberg's with just incognito, but if you block cookies from bloomberg.com it can't count how many articles you read and gets stuck at 9 articles left.
incognito doesn't allow cookies to be stored after exiting incognito, so in fact it does allow you to read as many articles as you wish simply by closing and re-opening the incognito tab. As another poster noted, FF incognito doesn't track cookies across tabs.
I know at the very least that you can get around Bloomberg's with Firefox's equivalent of Incognito alone.
I get around Bloomberg's using chrome incognito whenever I'm past 10