My mom doesn't want to stay

I'm feeling kinda crappy today. We found our perfect venue on Sunday, and it's "cheap" for a wedding venue in our area but it's still quite a bit of money for us. The price includes exclusive use of the building as well as cleaning fees for this etc. We're only having a small guest list as we don't really have any friends or extended family. In this price accommodation is also included and there's enough rooms for everyone to stay. But my mom and family don't want to/aren't able to stay the night. We're paying for it all so cost isn't an issue for them. That leaves us with 4 people out of 25+ who would be staying the night and I just feel sad. My fiancé has a point in saying why are we paying all this money for exclusive accommodation for no one to stay. There's no option to not pay it. This is the only venue we've found that suits us all round and in our price range and we don't want to have to compromise and have something we don't want but we also feel like it's so much money we're spending on accommodation and a wedding where literally all my family will only turn up for a few hours then leave.