Bro, it's just my opinion buut, rx560 is really weak for mining. Would be better buy nvidia gtx1060 and farm other coins (zcash for example). But nvidia cards are expensive too, so you can wait their next generation. They will anonce it in 2-3 months.
Nvidia are more PWR consuming so you have to think about PWRvsHash
And no RX 560 are not so weak for mining if you think about price.
Test before telling something.
My 560 are mining around ~15Mh/s and more than 480H/s on cryptonight.