MySQL databases vs static websites

Most open source scripts use mySQL databases, but there are several disadvantages which we have observed over a period of time.
1.These websites take up a lot of server resources, CPU usage
2. Bandwidth used by these websites is more for the same number of visitors compared to static websites.
3. When there is a connectivity problem with the mySQL server, all the websites are inaccessible, and have to be reinstalled again at times. They are also more likely to be hacked.
4. At times, they are not properly indexed by search engines and do not rank well.
5. When advertising code(javascript) are used on these websites, it loads very slowly, resulting in a loss of page views and advertising revenue.
So despite having used a number of open source and paid website scripts for different applications, some are reverting to static html websites and focussing on website content.