The action of charging fees on carry-on baggages will invoke consumers’ angers and complains; and to some degree, there will be a decline in demand. Many consumers consider such act as unethical. However, it is not a law but a convention that no extra service charges can be applied. As a potential customer, the extra charge will not have a serious impact on my decision of purchasing from Ryanair for the action is their way of making profits. Moreover, Ryanair is not the only airline company and if one is not satisfy with what he or she is paying for, tons of other European airline companies have better service. Thus, I do not believe Ryanair’s policy is unethical.

http://www.theage.com.au/travel/blogs/travellers-check/coming-soon-fees-for-carryon-luggage-20130819-2s65s.html