While I agree with the main point of the post(optimization, caching)the title is a bit of an exaggeration.
On a normal website 10M hits will not be evenly during the day this example hits are only an avarage of 10Kb, and the number of concurrer users are only 250.
Also the test seems to be done on a new wordpress installation. The more content you have, the bigger the database,the longer the comunication with your DB, the bigger the cache, ect...
In a real world scenario you proabbly would need something more than a $15/month virtual server to handle 10M hits in a single day.
On a normal website 10M hits will not be evenly during the day this example hits are only an avarage of 10Kb, and the number of concurrer users are only 250.
Also the test seems to be done on a new wordpress installation. The more content you have, the bigger the database,the longer the comunication with your DB, the bigger the cache, ect...
In a real world scenario you proabbly would need something more than a $15/month virtual server to handle 10M hits in a single day.
Still optimization is always a good thing.