This is not unusual for Thai destinations which are highly seasonal. I flew a few weeks ago DOH-HKT-DOH & I was 1 of 3 in Business on one sector & 1 of (IIRC) 5 on the return. From November/December until March/April it will be somewhat different. Sadly (or perhaps not) I shall be largely flying SQ/CX during this time because of the “blockade” hassle with AUH/DXB