I think a bit of tangible and intangible value:
A brand is intangible for example, the ability making friends with your look, blog design, attitude, your words, your behaviour that's intangible and often much more important than any money, because the money comes by itself through that intangible value. If someone can trigger emotions with that intangible value than it's more valuable than pure Steem Power.
Steem Power is a committment to Steemit as a shareholder for me, as a owner of the company. It offers also the opportunity to give more to the community via upvotes, delegation and that's what i like to do, i want influence, i wanna build the future of this great platform, i think Steem Power has that opportunity built-in. It creates curation rewards, some Steemian create more rewards via curation than via postings. That's the beauty again of Steemit, you have options!