Stainless match grade barrels are less labor intensive to manufacturer. Stainless barrel material like 416R machines easy and leaves a very smooth finish compared to CVM steel.
Stainless is more resistant to corrosion and is easier to clean.
I have three stainless AR barrels, two are coated and one is raw. It seems to me the trend is for coated or painted stainless barrels for the AR the past year or two.
ArmaLite and Noveske use 416R stainless for their target barrels.
This is a 416R stainless mini sass barrel from DPMS, a heavy bull profile with a Teflon finish. They are less than $200 dealer price and are very accurate barrels. I don't think you can match the price and quality in CVM steel.