11$ per day is good but how much do you pay for electricity?
i suggest you to invest all your earning in alts because they have more potential to grow.
Yes investing into altcoins as well as new ICO's with promising future will be a good investment as even i am planning for same i will get my rig with 4 cards up and running by next week and mining ethreum is the most profitable thing at this moment and investing those profits into altcoins will be the best thing anyone can ever do.