Why is darkrp so popular?

I think its popular as people enjoy making bases and fighting off the huge hoards of minges that try break in, also its quite a social game mode, a lot of people to talk to,
if your trying to make a server, best bet is to try make something unique out of the concept that everyone enjoys, and don't rush it, people wont join instantly, make sure theres things for people to do when theres not a lot going on.

It is so popular because it is easy for people to play without skills.