Lots of airlines that dont suport seniority and employs DEC tend to pay
.
DEC are fine if the company has NO suitable FO for upgrade. Some countries does not have a flow of experienced FO so most companies need to hide DEC. Most are expat that get need to get paid well to get them. But for locals is the same.
But I dont understand what economical benefit you can get if you hire a DEC in to a legacy carrier when you have several 10000 hs fo, that you trained for 10 or 20 years ready for an upgrade. Ok, the DEC will be happy but you will wasting all your time invested training that FO.