How come i'm still getting Gold players in my games?

I've worked really hard to get where i am and having a Gold player in my team, whether he's a smurf or not , i don't like how things work. I have a positive winrate and a mmr higher than my division, why isn't there a borderline for tiers? What's the point in having tiers if i get queued with someone 2 lower than me? If i'm diamond, i want to play only with diamonds, and so on. P.S. , his MMR was of a Gold 1, still, between gold 1 and diamond 4 mmr, there's a huge difference.
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