You are posting great questions.
Firstly, lets clear up on EOS. Its currently in ICO (crowdfunding) stage. In this stage it issues a EOS token based on ETH network, but this is just an intermediate until an independent EOS platform launches and becomes its own blockchain.
Imagine the platform as the land upon the store or hotel or restaurant... (service) is build. Owning the land is less risky and less profitable.
As investor you try to balance out the risk-profit ratio. How you balance it out, its your choice. I belive there are some wonderful opportunities in ICOs and Platforms at the moment. So Im invested in both.
I think your quote "owning the land is less risky and less profitable" sums of thing quite well. Makes sense when you think about it. Thanks for sharing your insights! I'll read up on the 70/30 approach and see how it fits my risk/reward ratio.