In a nutshell,
Who would you hire???? Two guys with similiar capabilites....one flew through hell and high water to make it to the interview in time and was happy to be there...the other complained about not getting a free ticket and lunch?
If BA were to offer a free ticket to london for every applicant whom made it to interview level, the company would be spending a fortune. Glide, you yourself would be coming from Oz which a duty ticket would take up very valuable revenue. How do BA not know that they could be spending thousands of pounds on free tickets for people to come to london who in assessement are not what BA are looking for, thats waisted money for someone to have a free ride and holiday in the UK!
Airlines like SQ/EK/QR/CX have to fly guys into them otherwise they would never get anyone. BA has a nice little hold pool at home BUT also the higher costs of these other airlines so things have to be put into perspective!