150? Ha! I've gotten more than him! The highest I've gotten was 172; but I was against low-level opponents, so I just kep killing tons of them over and over, suiciding so I can get more credits, and at one point, I was taunting 3 dead bodies at once!
You get 40 +- credits for winning a game, + (in a 1on1) 10*3*3credtis = approximately 130 credits max (without taunting the own body) in a 1on1 match. There is no upgrade to increase the credits no matter how often you read the wtf.
Oh it's even less, cause you can't taunt the 10. frag. What ever... 270+ is NOT posible in a normal 1on1 match.