The Internet can have an extremely low entrance barrier -- for less than $100 a month you can have a high speed Internet connection, a few domains and a host server -- you are now in business for yourself.

You can become an affiliate of many adult and mainstream products and/or services. Established people will share the profits with you.

In general the Internet is a growing market that you can still profit in but as the thread name states -- you got to pay to play but really you can start out for less than buying a food vendor's cart with a much brighter future.