I have heard that the loads with EK have not been as robust as expected.
The big draw for premium passengers to Glasgow will undoubtably be the dedicated EK lounge, which is a great facility and hugely popular. Given that the chauffeur drive service for premium pax for GLA flights covers all of Edinburgh, perhaps more Edinburgh residents flying in Business or First are taking their business down the M8?
QR have the upper hand at EDI, as their premium pax can use the BA lounge at EDI (which by all accounts is a very nice lounge) but sadly the Aspire facility is no match for this nor the EK dedicated lounge at GLA.