I have seen sevral documentaries on them and I do find them intresting. In fact my friend and I are working on a comic book together and one of our characters is an objectum sexual who is deeply in love with a life sized doll (who is NOT anotomically correct). He loves her so much that he finds a way to bring her to life.
Anyway they are intresting people once you stop and wonder why they love what they love.

isnt there a woman who married the eiffel tower

Yup, her name is Erika Eiffel

I'm totally fine with people doing whatever they want in their personal life, it's not my call to make. However, my opinion is that those people probably have some past issues or mental problems that cause them to completely reject not only their own species but anything living. It's a type of person who wants to love an ideal, who imbues spritual qualities into inanimate objects through their imagination. I believe that to them it is real love, but it is not a real relationship. A relationship needs feedback from the other partner and a true interaction.

But it is their life, it's not my business what they do.

I think it's weird.

I don't really know what to think

Everyone is free to fantasize about whatever he/she wants.