Meaning, that I would not be talking to the potential investor about lambos and mooning

Well, if you did that, then the investor will surely start running away from you ^^. The most important thing will always be the idea behind the platform and its potential.

Do you feel confident pitching STEEM? Do you have doubts?

I would feel very confident indeed, I think the idea to leverage blockchain tech to reward content creation is better than any other method out there, so in my opinion it is a matter of time for this idea to become mainstream, whether it is thanks to steem or any other blockchain working on a similar way.

By the way, I'm putting this out there because I'm about to give this a go

That's great mate, would love to hear more about this. Maybe you can do a post informing how this went :D