I can say for sure that buying a 1050 and 1050ti this is a very bad investment of your money, 1060 3 GB is not always good, the rest can be use, a lot depends on who made the card
Wrong. I have a 12*1050ti rig which gives 190 mh/s stable on eth. Also due to my tower frame, it takes less space then a average 6 gpu rig. It all depends on what price you are getting the card.
The problem with your argument is that it doesn't take into consideration power consumption and the long term costs. Consider the following ETH mining example:
12 pcs 1050ti mining at 15 MHs using 50w each will give you a total of:
180 MH for 600w08 pcs 1060 mining at 23 MHs using 75w each will give you a total of:
183 MH for 600wWhich is more efficient? Also, it gives you more density to your rig. You won't need to buy multiple motherboards, SSDs, RAM, etc.