because it mean also less trade
Well, how will you convince your customers to trade more if you increase your trading fees and charges?
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0.01% per 4 hours = 0.06% per day
0.06 x 365 = 21.9% per annum
Greed!
Charge 21.9% per annum BTC/EUR longs
+
Charge 21.9% per annum BTC/EUR shorts
===
Makes 43.8% interest rate differential between longs and shorts
Greed^2!
Is Kraken the greediest exchange among all bitcoin exchanges?
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Greed can explain many things but not everything!
Are BTC and EUR financing both equally available? Not at all. EUR funds are much easier to find at nearly zero interest rate while BTC funding is more difficult to secure, especially long term, resulting in considerably higher interest rate. Applying same rollover fees for both longs and shorts means you stimulate BTC/EUR shorts and punish BTC/EUR longs.
Why would a bitcoin exchange side with bitcoin enemies?
I'll be honest, I always liked Kraken. They have never been hacked, they are upfront with the audit which gives me a security especially after all of the exchanges had some security problems. They had by far the biggest fees until now, but I have coped with that for the reasons above.
But them increasing their fees again is not cool at all. I mean too much is too much. This doesn't matter much for a casual trader that trades there once a month, but for daily traders, this matters very much. I guess they will just lose some users because of this move.