- This assumes the end user is familiar with command line usage. The typical consumer of VPSes aren't, in my experience, and rely on something like cPanel to do all administration. Which is why you can't really run on 64MB.
- The site itself doesn't take up RAM, just disk space. If you have 1024 static sites the only thing taking up ram is the configuration of the sites sitting in Apache's memory. As long as there isn't a lot of traffic on the site, it doesn't really matter how many there are.
- You could have 1 static site that has a medium amount of traffic and it would bring the 64MB instance to its knees as soon as you have more than a few concurrent connections.
Anyway, from this hoster's experience, when I get a question like "What can I run on a 64MB VPS" the easy answer is "Not much" because usually the type of person that wants to spend $3/mo on 64MB VPS instead of $7/mo for a 1GB VPS doesn't really have their priorities in place.