If they're good, they'd probably rather play with honor.
Or they realize that most killstreaks are utterly worthless against a competent enemy except for EMP and VSAT.
I rather like using scorestreaks that allow me to annoy the enemy team, like the RCXD/HK. --- GT: Boomer and Tank Pretty darn confident..... I don't want to have to wait till the Microendony XBOXS 4ii comes out another 15 years later....
I don't have a problem with 2 players from my team running high streaks as long as it starts at Vsat because that is what usually breaks the lobby in your favor. And then they rage quit if the dogs/swarm are called in. I usually just stick with uav/cuav/vsat myself. Every now and then swap the Vsat for lightning strike --- "A wizard is never late, Frodo Baggins. Nor is he early. He arrives precisely when he means to." Booster Defense Force