Why does Matchmaking Punish you for Winstreaks?

Went on a 6 game winstreak, and then a 4 game loss streak where I've had multiple unrankeds on my team. Why does matchmaking make it harder for you when you win consecutive games? I guess it slightly prevents smurfing but it punishes people who actually are trying to climb out of their Elo. I'm **not** a good player - I've been playing for 2 years and am still Silver 2. In saying that, I do try my best in games but I'm nowhere as good enough to carry unrankeds being placed in my games.
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