On YC Demo Day, and those graphs
blog.noupsi.de
blog.noupsi.de
There's a similar phenomenon at top law schools (I was a lawyer in a previous life). When law firms come to campus to interview students, the school's goal is to obscure which students are top students and which aren't. Why? To protect the middle and bottom of the class and facilitate everyone getting jobs based on the school's brand.
The YC Demo Day format and the removal of the fundraising slide can in part be explained by the desire to obscure which companies will be hot (unlike say, if there are booths), so that everyone can raise based the YC brand versus just the hottest companies.
See, e.g., http://legalgeekery.com/2010/04/09/a-comparison-of-law-schoo...
At events like TC Disrupt, where startups demo in booths, few (perhaps no) investors ask for demos from all of them. The startups have posters and investors decide based on those which to approach and talk to further. In effect YC Demo Day presentations are those posters.
Has the type of investor changed over the past few years?
Do you think that "super-angels" are taking over from traditional VCs in that the costs of getting to scale are lower these days?
While 2:15 is most definitely short, it also gets you thinking about the 2 - 3 things that you want potential investors to remember about you. How can we be most effective in the least amount of time? It's an amazing exercise and it's very helpful for pitching in the future.
After pitching, the investors who really love your vision or idea let you know they are interested, and you have plenty of time to tell them more, show them your product, etc.
At the same time I am not sure you can do it any other way and still have the time for everyone to see all the pitches. You are right that longer presentations with a group this big would probably result in most of the audience forgetting most of what they see.
Personally, I only want to talk to investors who are actually interested in our space, or have expertise and connections in the space, especially when there are hundreds in the room (half the conversations would be a complete waste of time otherwise).
Investors are often not the target demographic of a particular product and given the range of products (wedding registry app, logistics/shipping software, developer tool for checking insurance claims, humor website, etc) most YC companies have chosen to show traction as a proxy for both demand for and quality of, their product as well as the execution ability of the team.
As others have pointed out, this is a great way to get an investor interested in learning more about the company.
If you have booths with demos, having more investors gathered near one booth might end up as signaling to other investors that this is the "hot" one of the batch, which results in more gathering. And where the investors cluster could have been a random event, or the location of the booth was better, etc. I can imagine founders spending all their time being big and splashy with swag and posters.
Also why have demo booths when it's an online service? Why not try it out from a customers perspective and log onto the website. If you need someone in a booth to step you through it then I would be very surprised.
Sounds like a perfect solution. Why not?