Probably reasonable, now we should expect another surcharge on your total flight price ala wheelchair. I worked out on the back of the envelope how much this might be, I reckon for Ryanair it should be less than £1 a ticket, but then what do I know?
As an aside, BA today launched an 'innovative' new service which is a funny word for them to use as it seems they have copied what Ryanair do right down to charging for food on board. Well I guess it's not quite the same, as domestic fares will start at £25.
http://business.guardian.co.uk/story...=ticker-103704