Again, we'll probably be moved soon to SLF but
NSF makes some interesting points :
if , for example, you miss a flight with Ryanair you would expect to lose just the ticket fare and credit card booking
However if you try and recover the PSC you will find Ryanair will make it v. difficult to do so
- you haven't passed through to Airside so haven't been through the check; why should you have to pay ...
in addition Aer Rianta or whatever they call themselves today do publish their charging breakdowns on their web pages if you are interested.