I don't think this happens with everybody, but I have been invited to participate in projects almost 12 times per year. Yes, on average one project per month. For sure, many of these projects haven problems with idea or way to make money.
I accepted the changeable a few times, and I would like to accept it. I think I have good eyes to understand the business and a good experience to be able to help people about the best solution and approach.
I have been working with different kind of projects. Some of them failed or it just wasn't possible to continue. But some of them still running.
Here is this list of projects I have been involved as a partner somehow.
If you have an idea, contact me. Let's talk about it and maybe I can help you with your project or maybe I can participate in it.