[antisthenes]

Heh, I have some that I think are commercializable, then I go online and look for companies that are doing similar things, and lo and behold, there are already several competitors who are doing a pretty good job.

At least a good enough job that there's no way I can easily cut into their market share or take some of their clients without significant outside funding.

[Trasmatta]

There's nothing new under the sun. Almost all ideas will have already been done by somebody else. And if nobody has even tried it, then it's possible it's not a good idea.