I think that what we're pointing out is that there may be a more accurate options for fuel pricing than AP currently uses.
Yes it might cost more, however using your reasoning - should AP users have the option to choose to for pay less for inaccurate information?
We use iFly because it has consistently provided us with up to date, easy to comprehend and accurate flight data. If it cost us a few $$ more, so be it. I wouldn't quit using iFly over a few dollars here or there.
I'll acknowledge in advance that fuel prices can change at a moment's notice...that said:
If GlobalAir can be shown to be consistently inaccurate, why use them at all? I'd rather see no fuel pricing than inaccurate pricing. In my experience GlobalAir's lack of reporting for accurate current fuel pricing and pilot services means that I always need to check other sites to see what they report before heading out on a flight.
FWIW I have no affiliation with any fuel pricing sites.