The point of the top 50 isn't to win cards, but to play against the weekly top 50 accounts' decklists. You get a larger sum of electrum from beating a top 50 deck than level 3. That is the intended motivation to play against the top 50. Occasionally, a top 50 player will make a "rare farm" deck containing nothing but rares. You will win every time and will get the chance to win up to 3 rares from the slots. This is pretty common among some top 50 players, so open up chat and ask around to see who is running a rare deck.
It really would be pointless to play against the fake gods if you could win upped cards in the top 50. It is called level 6 for a reason.