150 G28 equal the network hashrate of Groestl. So you can do the math.
Actually I'm new to the mining, so I don't know how to do the maths
But anyhow I would be glad if someone could tell me how to calculate it 
But I understand that this machine will not be that profitable
If 150 G28s equal the Groestl network, then:
If Baikal sells only 150 then you may make $25 per day, assuming all GPUs are kicked off.
If Baikal sells 300, then $12.5 per day
600 = $6.25 per day
1200 = $3.125 per day and so on.
And finally, Baikal will sell thousands of these, and hence you will be lucky to make a $1.