Now such prices for all cards as 1060 is dangerous to take and even 6g, but who buys 3g is generally a mystery to me .. Why? I have all farms for 1060-6g, they have paid for themselves for a long time and are mined for profit, but I do not buy new carts, because it's dangerous to do it in an apartment, everything will be fucked up
The 3gb are, on average, $100-150 cheaper, and depending on memory some of them run more efficiently for some altcoins, so you can recoup faster. The line is growig narrower, but you can still recoup and profit with a 1060 3g rig if you're smart.
(I do not own any 3gb, I do have a 6gb rig, but just saying)