What, you got shares in Cosworth or something? If Cosworth were any good, McLaren would be looking at them, so would Red Bull, so would Force India. Face it, any team with money will buy the best engines, and no one with money has bought a Cosworth Engine for ages. Cosworth F1 engines not that bad? Yeah, maybe compared to an Indy Motor, but compared to other F1 engines (which seems natural given they compete in F1) they are the worst.
PS BAR never really did well either. Especially given the prodigious amount of money poured down their toilets (I'm only assuming that's where it went, because it didn't go into race-winning cars).
OH and PPS - where was I being extreme? Jordan won with a Cosworth Engine in 2003 when everyone else made like it was a GT5 shuffle race and punted each other off the road, but they haven't had a consistent winner in F1 (as I said, besides the cheater Benetton) since the very early 80's.