To Op , what you are asking , paid hosting is used by all serious businesses. Please clarify your question
You're asking if paid hosting is worth buying? If so, the answer is yes because you'll find better uptime and usually access to more server modules that many scripts will require to run properly. If you're asking whether or not it's a good idea to buy paid hosting from multiple companies, the answer would be yes if you were looking to build and host a network of websites for SEO purposes.