I don't think it would be too much to say something like a low-end VPS on AWS or Digital Ocean for a personal blog is too much, which would end up running somewhere between $5-10/mo depending on resources/automated backups. At 400 euros, though, they're quite a bit beyond that. I'm a bit curious what their cost per page-served ratio looks like.
If his stats are correct the numbers are right there. It’s roughly 100k views in around 2800 days. So that 36 views/day. If it’s 400€/year then it’s 1.10€/day to serve those 36 views so we’re looking at around .03€ per view? That seems like a lot.