1] Cause I didn't want to sacrifice my specs for a high end monitor.How can you have those awesome specs with such a shitty monitor?
2] I have enough money to buy a good monitor now. But I ain't buying anything unless it's G-sync, 1440p+ and HDR compatible. And they are not available in my country yet.
Do your math :P
[On a serious note though, I tried 144Hz monitor borrowed from my friend before, and no, I ain't getting any monitor unless its G-sync or Free-Sync. Games just don't look that smooth at normal 144Hz.]