One strategy that you can benefit by exchanges difference selling/buying BITCOIN

I know the you probably dont use PLN to trade on BTC but I have one big BENEFIT for you about it.
on Bitbay Exchange - https://affiliate.bitbay.net/6949 , when BTC is going up on bittfinex or other places in USD or EUR Bitbay is always is a little bit behind. In that way you can always buy cheaper when its going up or sell more expensive when its falling down. For example you can sell on highest point on KRAKEN EUR buying at the same time on Bitbay a little bit cheaper when its going up. The difference is about 1% in favor. So even if you need to exchange PLN for USD or EUR its worth it!

The differencje for example at the last rally was 10-15 USD on 1 BTC.