Turning a startup to a successful venture is not that easy. The success rate vary from sector to sector and can go up to 10%, but it is usually around 3% to 5%. That means that 97 out of the 100 people who invest money in these startups lose their capital. The chances are that it will leave you knee deep in debt, rather than making you a millionaire. 

http://www.businessinsider.com/startup-odds-of-success-2013-5?IR=T