My post above (#315) does not suggest anywhere that EF do not have the right to tailor their offers how they wish. I am no genius user of the classical or online English, but "Scrooge-like" meant "un-Christmas-like act during Christmas season", and the smiley that I was more amused than anything else.
However, inviting people to give you their money while putting restrictions on what they can and cannot buy with it, does seem to bring a "Soviet touch" to the marketplace and customer service.