The cost alone, to say nothing of the technical knowledge and time, would be prohibitive. By linking the Worldprofit Malls to your web site. That's the best part. That's just the point. This makes the 10 Worldprofit Malls a better value every single day, and the decision to link them to your web site even more sensible.
Today there's only one, with a second barely alive.
All the others tried to make a go of it, but failed. One, by offering more value, being run more cleverly, never taking anything for granted and constantly going the extra mile for its advertisers, ended up dominating the market. The same thing is already clearly happening on the Internet. In the next few years, people will establish literally billions of web sites. If this is acceptable to you, fine.