I started to farm last night T50 (first time ever for me) and noticed something similar. The same 6-7 players I seemed to get over and over in the first 2 hours. Unfortunately 3 of the decks would crush me with no hope of living. 2 others was a 50-50 depending on my draw. Then I bumped into 2 farm decks, got a rare from 1 and 3 relics from another.
I then started to start matches, reset if they were not a rare farm or unique player. 5 hours later, I had bumped into 4 different farm decks. Won 22 relics, 6 weapons various, 10 shards (I wonder if you can win the upgraded versions already, never seen it) and a couple other misc rares. I would stop on new player names the odd time just to see what they were playing. Other then that, just kept looking for those farms. Was interesting to say the least.
The funny thing CB! had a farm deck up, but twice I lost to it due to a very bad draw on my start, his deck actually pumps out a fair bit of dmg if you don't have any defenses (mine doesn't lol), its a Lava Golem rush deck.
All in all, I lost a ton of money initially by recycling but came out 2.5k ahead due to finding the relic farm. It only worked since I did happen to find a relic farm. If not, I would have lost big time money.
Well back to normal grinding for me, need the money now to upgrade my newly obtained shards!