PaperTiger: I'm not defending WJ 'mining' the family site, just pointing out that there is probably nothing on there which couldn't be gleaned through other means.
If WestJet was getting the number of sold seats/unsold seats on particular flights through this website, which I understand non-revs can do (if not always through a website), that would be information not available publicly and definitely not available through a normal CRS. Public CRS displays will only tell you that at least x seats are available in a particular cabin, and x is no more than 9 - often as few as 7 or 4 depending on airline. Access to the number of seats actually sold would be access to a goldmine of data - all confidential to the airline.