I heard some time ago that you lose electrum/score for farming bronze. Is dat true?
Electrum no. If your score is high enough though, itll go down a little even if you win.
Your score has no effect on what you get out of bronze. PvP1/PvP2 are the only environments where the stats of your account have any impact whatsoever on your rewards. Assuming a sufficiently high win rate, you do not lose either score or electrum from rewards bronze. Due to the fact that rewards from winning in bronze are lower than the cost for losing in bronze, you have to have a win rate of around 60-65% in order to break even or pull ahead overall.
There was a rumor for a long time that you would lose electrum/score by
winning in bronze. This stemmed (as far as I can tell) from two things:
One is the mistaken assumption that you paid the lose price for a match even if you win, which would result in paying more to start the game than you'd receive from winning it. This is not and has never been the case.
The second thing is that there used to be a bug which resulted in arena paying 5 less electrum than it was supposed to. I don't recall the exact causes for this bug, but it was fixed. Even when the bug was in effect, in order to have a net loss of electrum, you would have to win every game at approximately 1 hp (and bronze would have to be swinging low on its rewards), and the net loss of electrum would be
tiny (approximately 30 electrum per hour or something IIRC). However, as I mentioned, this has been fixed (and has been fixed for quite a while IIRC).
TL;DR: You
absolutely do not lose either electrum or score by winning in bronze. Bronze is net profitable in score and electrum (just from plain rewards, completely disregarding spins) at around 60-65% win rate.