I think comming from a price perspective of $199 is a really good price point considering you get mobo and cpu.
My only concern when it comes to mining is that the cards might not have enough airflow(ofc depending which cards you have).
So with PCI-E risers and cards hanging in the air, you don't actaully have anything that restricts the air from reaching your gfx cards, where as this board will restrict airflow going to your cards from one direction.
I have seen a review of this board on youtube and it looks promising comming from the price point.
I guess with the biostar BTC boards you can at least use it as a normal pc if you want to one day.
Yes, the combined price for a reliable and efficient mobo with CPU is very attractive.
Airflow problem can be solved by adding powerful fans to blow air on them or by putting the mobo and GPUs into our 4U rack chassis case that has 7X delta fans, 4 in the front to push cool air in and 3 in the back to pull the hot air out. Also, if your cards have really thick coolers then it gets tricky, so this mobo works best with cards under 4CM thick.