This seems like throwing out the baby with the bathwater. Why would you not go to a demo day with some of the best signal-to-noise ratio on the planet?
I haven't been to a YC demo day in a while, but I assume that many/most companies don't close their whole rounds in 24h. Why not just say, "I liked your pitch-- I'd love to sit down with you guys for an hour or two tomorrow to talk thru it a bit." and then go on to describe how you like to add value/be involved.
It's possible that all of them aren't looking for hands-on-guidance from their earliest investors... But perhaps some of them are.
I haven't been to a YC demo day in a while, but I assume that many/most companies don't close their whole rounds in 24h. Why not just say, "I liked your pitch-- I'd love to sit down with you guys for an hour or two tomorrow to talk thru it a bit." and then go on to describe how you like to add value/be involved.
It's possible that all of them aren't looking for hands-on-guidance from their earliest investors... But perhaps some of them are.