As a non BALPA employee I don't, however based on what I know of the industry.
Use of conferencing facilities and function room + 1 seminar room for lectures would probably be around the £1,500=£2,000 max. for the day.
The airlines attending probably have to purchase space, dependent on the type of display, you are looking at £40/sq.m. Smallest stand will be 3x2 = 6sq.m = £240, multiply that by 20 odd airlines.
And on top of this cash generator, charge attendees £60, from the organisation who's sole purpose is our welfare. Why insist that attendees buy lunch which adds an extra £10-15 a head via the hotel.
The idea of bringing employers together, good.
The exploitation of us by yet another org/company/school, rancid.
I gather from your response you think charging £60 is both value for money, covers their costs and is therefore necessary?