Per EA (a somewhat more reliable source than volo et alia parroting how ME2 sold a billionty billion copies!!! FACT!!!) ME2 had only sold 1.6 million units after three months, a full million less than DAO had at a similar time. I'd suspect either Baldurs Gate game/ NWN or KOTOR made more absolute profit even if it was distributed to a lot more parties as licenced IP/ publisher deals since the teams that made them were far smaller than those that made any of Bioware's recent games.
I'm not exactly sure how BG, NWN or KOTOR are relevant to the question of DAO (probably) having had an astronomical budget? Since I get the feeling you're trying to disagree with me, but the statistics, while interesting, aren't exactly relevant from the "theories why EA is pushing DA sequel out so quickly".
The prevalent ones being A) they're EVIL b1) DAO cost too much and b2) didn't work as a DLC platform. )