Although .info is cheaper than .com and .net but .com and .net are still more popular, users tend to believe in domain names ending in .com or .net. It's just like tradition, so deep in the minds of the seekers and hard to change.
.com is the top level domain.People had a habit of typing website name with .com extension.Its just because people are used to .Domain .com extension have more traffic as per other extension .