£30 per sector for an infant is a high fare to pay compared to most other low co plus you have to pay £10 carriage e/w for extra items of luggage. Some fares for an Adult are less than half that price at times which does not add up.
£20 per sector with Easyjet for example and no extra carriage charges for an extra item.
Luggage is also higher in charges for 20kg, excess baggage too.
I think Easyjets prebooked seats are cheaper too aren't they?
It all adds up!