Are your monthly recurring fees for 1 website? In other words each site has separate recurring fees?
Yes. However, you can add multiple domains to a site. This allows you to host separate landing pages on the same plan.
If you want to maintain two fully functional sites then it would be two charges.
Seems to be different schools of thought on this subject making it difficult to know which is best.
It is. This is why we also include powerful redirect tools to 301 & 302 domains and links to maintain SEO juice from prior sites.