It recently dawned on me what sort of scam this is.

I return from Doha-DXB-Doha is 430QR even with miles. These are apparently 'taxes'. Since the actual taxes on the route are 70 riyals, I can only assume 'gullible moron for falling for this scam' tax is 360QR of the total.

If you book Dubai-Doha-Dubai with miles, it's a spectacular 675 AED. Don't even ask me how that one works.

The only solution is use Emirates, get Skywards miles, 9,000 miles to Dubai plus 70 riyals.