The cost of a shipment fron Finland to Nice is more than 5.99€, this is probably just the amount the seller charges you.
Some do even free shipping, put it still cost to ship the item.
Anyway, your shipment will be delivered when it arrives, maybe in 2 days, maybe in 4 days.
Some shippers pay for a guarantee delivery the next day and then the same shipment costs about 60-80€, that is were you make profit. ;-)