And some downright strange ones. There was an OP the other day who was married, but lived separately from her husband because he couldn't stand her kids, and also wanted to keep his finances completely separate to the point that she described him as "secretive" about them. She herself got offended at the idea that she ought to have some idea of how much money her husband has.
It's a frigging financial contract!!!
When asked why on earth they'd married, she said they wanted to make a public declaration of their commitment. But private transparency between the people involved in that commitment was verboten. For them, it seemed that marriage was about a public status. It certainly wasn't about "all that I have, I share with you". For some people, marriage is a religious commitment involving God. For others, it most certainly is not.
For the record, I don't think it's generally a good idea to marry someone you don't care for, although you can get successful marriages of convenience as long as everyone involved is fully informed and consenting. Perhaps they're more likely to last, I don't know.
But one thing is clear: marriage means different things to different people and you simply cannot dictate how everyone else ought to feel about it.
The only thing they've all got in common, assuming they are legally binding ceremonies, is that they all create a legal contract between the people involved. It's foolish to ignore that.