The OP fails because the claim is that most DS games are profitable, not that they always sell well. The fact is that DS development is a bargain, so even a moderately selling game can turn a hefty profit.
The only thing the OP showed is that two new IPs didn't have spectacular openings.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs