This makes no sense, like at all. If you try to learn pvp from low levels, you doing OK, and play lots of BGs, after you hit 50 you jump right into the deatmatch elite. Where is fun in that?
I have started a new char (after a long break) few days ago and mostly leveled through bg. At 49 lvl i was ranked 73. Im prob a little better than average lowbie player, but being dropped right into the pit with veterans who play the same char for years...
And btw, why its so easy to get into the top 100 after playing few hours per day? I remember in wow people had to grind almost without sleep for weeks to get to the top ranks (when marshals and sergeants was a thing)..