In today's mining world is 200$ good for 30MH or its a stupid investment like a friend said.
30mhs $200 was good in 2016/2017, this cycle around $200 should be 60mhs, next cycle 90mhs minimum on etc.
That would be a difficult range to achieve because we are now at 300$ in the best possible case for 49 Mhsh which is somewhat of an improvement but not that much compared to the ranges you are referring to.Nevertheless electricity plays a big role here,I would buy cards at 300$ for near 50 Mhsh,6 of such card can make a mining rig at 300 Mhsh for just like 2200 USD in total so still worth a shot in my opinion.
The ideal ranges should be those ones you are referring,getting a Rtx 3080 in the next cycle for 200 dollars would be a nice one.
he can get 5 rtx 3050 new for just under 2k
he can get an eight card board with no risers for 100
he can get a bitmain psu for 100
2200 and the gpus are under warranty for 2 years maybe 3.
that is only 5 or 6 a day and power is maybe 15kwatts a day I have 5 cent power but in the home I have 17 cent power
so my cost is 2.60
say 6-2.6 = 3.4 a day that means 700 days to pay it off. not great if eth goes by by