I did roughly 3,5-4,5k minigames from 6-10 and the vast majority of kills was from this period of time as well. And i had a 4 to 1 win/loss ratio, the benefit of being a VoM dt when aa was released.
I had maybe 1000 minigames after i hit 10. Im a bit uncertain, i gave away my account maybe 6 months after i hit 10 and started a new one.
Edit
Actually i just checked and i leveled my Guardian on this account to pvp 7 solely from open world outside of borderlands. Some or that leveling was made before i hit 10 on my dt.