Curse
Many buyers follow the fake persons or a trust less person blindly.So check this first about the identity of the company and it does not matter that what ever the benefit and the profit is being offered from that company.
Absolutely,it is a good business but if you know about the core principals and art to do this business.Without knowledge,do not try to engage your self in this business other wise it is a best way to earn money.
Stock demo account :
What should i say ? You can say this an entrance or a gate pass or a permission perhaps to do shares business in stock exchange.It is like your validity and verification account.