Well I thought about it at Christmas when the media was all over BTC and decided that "during a gold rush, sell shovels", so instead of taking a risk and buying bitcoins or a mining rig I setup
www.cloudminingreviews.com for $10 and made a profit the first month and a steady weekly commission since then plus BTCs from direct banner advertising.
If you notice the ones making it are the hardware providers, e-wallets, payment network etc. If you have 3-10M you should invest in the infrastructure or an ad-based platform.
I would entertain the idea of selling my site :-)