Coming from a shared hosting service I am used to organizing all my sites in different folders and configuring each domain to point to the folder where the site is contained.

For example
www.site1.com -> /site1
www.site2.com ->/site2

I have so far moved one of my sites over to DO but not sure if the second site should be on a separate droplet or if I should just set up a virtual host on the droplet already created.

Regardless of how much traffic each site gets, what are the advantages/disadvantages of creating a droplet for each site vs hosting both sites on the same droplet?

Would it cost more to have each site on a separate droplet vs both sites on a single droplet (my guess is yes, plus maintaining multiple droplets could be a pain)?