Quote from: socks435 on March 17, 2018, 04:00:43 PM

Quote from: hanlieuiypm9832 on March 17, 2018, 02:07:57 PM

Quote from: yhoga45 on March 17, 2018, 01:41:34 PM

Maybe if your electricity is free or cheap mining is still worth, but if your electricity cost is expensive is not worth. Remember, a lot of peoples mining and it makes coins difficultly increased and the market condition is not supported now.

You are right. The mining market is very mature now, there are plenty of companies running their mining farms all over the world. The key factors are electricty price and calculate power(equipment).

Mostly companies are GPU distributor and then they resell their cards for higher price. They earn from mining and earn from distributing the cards..
That's why the difficulty is getting more increases and the price of cards is getting increase because they are holding gpu while mining then they resell them in higher price..

As of now i still getting profit but it takes year before a can break my ROI so before i break the roi i think selling them would be the best choice because i think nvidia or AMD will release a new graphics card with higher performance than to old cards.

It is a wrong idea to buy used GPU from anyone I presume. Especially without discont about 50% from stock prices. They do usually with ASICs. Mining in the basement and then sell to young miners. Also not good idea to buy it because only first batch of ASICs usually have nice ROI. And better buy if from producer in China directly. Time is a money when dealing with ASICs. 3 monthes is an epoch