I have used shared hosting for over 7 years before I finally decided to upgrade to a VPS server. When I was using shared hosting, I had so many problems with malware, slow loading time, brute force attacks and so many other issues. Now, my life is so much easier with VPS. What amazes me the most is the support team; they simply exceed my expectations and they are ALWAYS available to answer my questions.
Shared hosting is a simple option to set up a site and start accepting visitors ASAP. Unfortunately, it can quickly backfire when websites grow in popularity because more resources are consumed and more sessions are delivered each moment. Eventually, things can come crashing down or slow to a crawl.