No its not you still make $20 a day per machine where are you getting those numbers from!
don't think in $... the siacoin will increase in value... i do 1050 siacoin per day... and if you want talk in $... if the siacoin increase to 0.04 it's true value actually... you've got more than 40 $ per day... Siacoin miners will Hold their coin and don't sell to peanuts...