Decred = 3300 dollar month... SIA = 4700 dollar month...
(I think for real, maybe half of it...)
The Obelisk miners seem to have an absolute great advantage to all people who (merged) mine Decred or Sia with their GPU right now. Not all miners who mine Ethereum or Zcash mine merged. I think it is just a small percentage because you need extra power for your GPU's it is not free, to mine merged (it costes extra) There are also people mining with FPGA's (Ztex, Icarus, etc.) on Decred right know and if these Obelisk miner is real "real" (I am still not sure) then we see the true switch from CPU --> GPU --> FPGA --> ASIC. At this point Decred and or SIA will have their own ASIC and more fullgrown?? more futureproof..
I really like the DCR1, more than the SIA SC1 miner (personal) but they need to show us this is real stuff.