>>358507648
That's not a sustainable playstyle unless your team is winning, people are saving weapons for you or you're easily topping the scoreboard. I buy cheaper utility almost every round and I'm often forced to compromise on armor or weapon when the team is losing. 
Canted sight might have been screwing you over though, it has no entry in any balance tables so the effects are unknown. Otherwise the M16 has the same $300 kill reward as M4 for $400 less and Acog only lowers that by $50.