Right now setting a billing alert only allows using whole dollar amounts (eg. $5, 6, 10). Most pricing also seems to occur by simple amounts (eg. $5 for a simple droplet). However the alert system includes the tax for an alert. So if I set a billing alert for $5 because I want to make sure my $5 droplet doesn't go above it's limits I will be notified because the actual billed amount is $5.25 (GST). Why is it not allowed to set exact amounts for my billing alert so that I don't get notified when my droplet is acting normally?