I don't understand why ppl give them 1 star review...

I don't understand why ppl give them 1 star review. I randomly bought one of their monitor online 3 years ago, because I didn't have much of budget for a monitor at that time. it's still working. I'm a heavy computer user for both work and gaming, the price and the reliability, I have no point to take a single star off.
Although I wish you guys produce some more advance monitors like Samsung, Asus or Alienware kind of 4K 144hz gaming, or even WQHD ultra wide screen. I know you guys are trying to keep the price low to support low budget customers, but... for whatever keep up the good work!