ExXB,
In response to your last question: at ezy, each Cabin Manager is given £60 when promoted to carry as their float, half of this is carried in euros. Now multiply that £60 by the approximate number of Cabin Managers employed, say 2000, that gives the airline £180,000.00 out of circulation, losing value by the day. If you were an airline maager, trying to squeeze every penny of profit, would you give more float, say double the amount, £360,000.00?
This amount of change, further, doesn't go very far if the first three pax pays with a £20 note, hence the crew tend to not have enough change on their first flight.