I don’t want to seem tight but is it wrong of my in-laws to charge us for Christmas dinner?

Do you think the woman is being unreasonable?

We're fully embracing the Christmas spirit at the moment. Christmas FM is playing, the house is starting to fill up with tins of Roses and we've been dreaming about those Stephen's Day turkey sandwiches. But do you know what we're not looking forward to? Dealing with certain family members. One woman has opened up about the Christmas dilemma she is facing. We can all agree that the Christmas dinner is one of the highlights of the big day, but imagine expecting your family to pay for it. Well, this is what her in-laws expect. The woman told Mumsnet, "BIL/SIL hosting Xmas Dinner this year. I've hosted before. Basically, they are charging us per family for dinner. She explained that she has never charged them before, but they will because they have a lot of guests going. She explained that they're planning to split the cost evenly between all their guests. They'll also be purchasing a lot of champagne. "They know I won't be able to drink as it's just assumed by everyone I'll do all the driving. I don't want to seem tight but charging for Christmas Dinner for me just feel I would of course have taken things around or would have been perfectly happy if they'd asked me to bring a certain course etc." Her husband said he agrees with them because they will be doing all the hard work. "I've never charged them and would never dream of it. It's really put me off going but of course, I will keep the peace!" Many users agreed that they would not attend the dinner. Another said, "I do not understand this mentality. I would stay at home. You do not charge people for dinner in your own home no matter day of the year it is." Do you think the woman is being unreasonable?