My experience on a new account I made to practice a few champions has been interesting. The games have 1 or 2 actual new players then the rest are anywhere from bronze -> diamond (Actually have had them go onto main accounts / etc). On average the cs and overall playing has far surpassed most games I've had on this account. On the new account, I've actually seen games where everyone groups for baron, dragons, wards, and obtains that 7 - 10 cs per minute (It's actually common to see 50 - 80 with trades / harass at 10 minutes on that account).. I've also had games where one team is up 40 kills and 20 k gold while the other is literally rolling with people building pure attack speed or 4x doran's shield..