I am involved in a bunch of smaller things, each with different people that I met along the way of doing other things -- serendipitiously -- and I never felt the need to drop everything to do a big, risky startup around a "great idea" or a "great niche market". None of the smaller things I do, actually has a full-time person working on it. That's the beauty of websites. They are always there, but there is no need to attend to them on a full-time basis. It's all running on solar power and wind energy ;-) I may do something bigger one day or another, but I don't see the pressing need to actually make that happen. It will only happen by serendipity.