Im a business woman and I have to look at my bottom line all the time. With space like any other place on earth I wouldn't want to invest before the market is ready. In this case the market of space has to weigh out as cost effective. We do the same thing on earth. Then after a few years we find new ways to break down minerals and extract their value later.
Lets look at cost verces gain again.
Landing on a planet like Mars to extract a few minerals then blasting them and your crue back up into orbit and send it all back to earth. Or Flying by a few asteroids grapeling there ass and pulling them back to earth with just one Space Tug. Never mind having to support the crew on their entire journey. But I would like to see some real return from my investment. Taking risks and all is fine.