are you serious? do some research, it is true that cpu has lower roi but they will hit it... When zec was out the first 2 weeks were great for cpu miners + ryzen should have greater performance and consumption, I need some cpu to my rig, why not buy on which can earn me money?
first of all you did not ask him but you asked me ... second : on cryptonight the cpu has more profitability than gpu , and there are still some coin mineable only by cpu. the problem with cpu is that for each cpu u need a motherboard and so on , making them very expensive for mining , but if you consider that for each cpu u can pair 6 gpus.... then you are gonna roi pretty fast...
just fyi : at the moment 2 opteron cpus are capable of pulling 900 h/s at less than 100w in monero. such cpu combo will cost around 150 Eur (like a graphic card) problem is that you can
stack up to 4 cpus in an opteron motherboard... and 4cpus mobo are blody expensive....
so CPU WILL HIT ROI , and CPU ARE , ACTUALLY , MORE PROFITABLE THAN GPU , they will just roi slower due to the bond , usually 1 cpu - 1 motherboard.
imagine make 1 rig and for each rig use only 1 videocard.....
here is 6 , SIX, stupid examples of coins that used to bring me not only roi with a cpu but also some serious profit (from oldest to newest )
1 ) BITCOIN (in 2009 was cpu minable only)
2 ) XPM
3 ) XMR
4 ) XMG
5 ) ZCASH
6 ) PASCAL
and this just coz i aint mined zcoin ........
not to mention that MAGI (XMG ) is still cpu only , and there are more coins cpu only.... but better not to open the eyes to ignorant.... better leave them in the darkness...