Yes,it is need an investment and it is not easy to create an own coin,because It requireS a lot before it make.like you need You need to have a programming skills.
The best place to sell your altcoins would be the exchanges, but that is just an opinion. Soon probably we will see alternatives and not just exchanges!
Bitcoin has more worth than any other coin because they are in high demand. The main factor that determines this are
Demand
Supply.
All other factors depends on this two.
its a scam,I think it's useless, you can be blocked once the exchanges found out that the real owner sold the account to another. its pretty simple to make yourself verified on your own.