Actually its the perpetually losing players who should get prizes and decks as well as those on winning streaks.
Why?
Because they need help to become winning decks more than those winning. 
The majority of daily quests in the current rotation reward playing games, regardless of who wins.
Many other rewards are given for logging in, or for just having an account.
The only places that reward winning and not playing or losing are (10 gold for 3 wins), the monthly reward chest, arena rewards, and the free pack for the first Tavern Brawl win (but after sufficient retries I have so far never been unable to get at least one win).
So I guess your advice is already taken to heart. A lot of rewards for everyone, and on the larger scale of things a smaller extra award for winning or for winning more.
If you propose that winners should actually receive less rewards in total then winners, then I have to oppose your idea. It would encourage F2P players who want to get as much out of the rewards as they can to lose on purpose, and any player who wants a real game will be disappointed if their opponent tries to lose on purpose.
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