How about having pence/cents or whatever in the prices - so you can set a ticket price of £99.99 rather than 99 or 100? Its trivial I know but id like it. Increasing prices by 0.5 AS would be good.
It's pretty useless since prices in AS are not such a vital factor for pax distribution (yet), and my mind assumes that would be heavier for game to calculate for some reason (my mind isn't very good in programming so it might be wrong)
I would guess that changing a bunch of integer variables to floats is not fun to program... certainly not if there's no good reason for it.
OP, you can always imagine that the prices you see are rounded, so if it shows AS$100 it's really £99.99 ;)