Atrium and Justin Kan - how does he attract such an amazing investor base ?

From TechCrunch https://techcrunch-com.cdn.ampproject.org/i/s/techcrunch.com/wp-content/uploads/2017/06/lts-team.jpg?w=1024

The Atrium Team 

A year ago , Justin Kan raised $10.5m in Atrium from blue chip investors,  ended up being one of the biggest “party rounds” ever....

 would be interesting to see what’s happened since?

 Atrium LTS — the “LTS” stands for “Legal Technology Services” 

As a “power user” of legal services over a decade in the startup industry, through the foundation and fundraising of startups like Justin.tv as well as the work he’s done as an investor and advisor to companies through Y Combinator, Kan says he was frustrated by how little technology was being used in the process of interacting with various law firms.

“Why don’t law firms use project management software to track where they are in the process of completing a deal and let customers see that?” Kan asked. But more important than the way in which law firms interact with customers, Kan saw an opportunity to streamline the work that is done in-house to make it more manageable for lawyers and those who work at law firms.

“If you think about corporate legal work that’s done today, some part of it is art and then some of it is repeatable processes,” Kan told me. It’s those repeatable processes that the Atrium team believes it can innovate on to make things more efficient.

Now onto the funding… As we reported, the round was led by General Catalyst, but what we didn’t know at that time is that the financing includes nearly 100 institutional and angel investors who came along for the ride.

Other participating firms include: 500 Startups, Arena Ventures, Balance Ventures, BeeNext, Binary Capital, Box Group, Brainchild, Caffeinated Capital, Early Impact Ventures, First Round Capital, Founders Fund, GGV Capital, Green Oaks, Greylock, Initialized Capital, Jackson Square Ventures, Liquid 2 Ventures, NEA, Oriza Ventures, Palapa Ventures, Palm Drive Capital, Shasta Ventures, Signia, Slow Ventures, Soma Capital, Struck Capital, SV Angel, Tekton Ventures and Thrive Capital Partners.

And here’s a list of all the angels investing in the round: Aarjav Trivedi, Adrian Aoun, Amitt Mahajan, Andrew Chen, Ari Kardasis, Armaan Ali, Arram Sabeti, Avichal Garg, Bennett Rogers, Brent Goldman, Brian Goodman, Brian Shin, Josh Buckley, Charles Forman, Charlie Songhurst, Chris Fanini, David Cheng, David Schellhase, Desmond Lim, Dharmesh Shah, Emmett Shear, Eric Glyman, Erik Torenberg, Eusden Shing, Matt Brezina, Gil Penchina, Greg Chang, Immad Akhund, Jack Newton, Jason Tan, Jenny Haeg, John Doerr, John Hering, Jon Dahl, Josh Reeves, Karim Atiyeh, Kevin Lin, Kyle Vogt, Lee Linden, Loren Vittetoe, Manish Shah, Matt Gamache-Asselin, Maxim Zasov, Michal Borkowski, Mike Ghaffary, Mikhail Seregine, Osuke Honda, Paul McKellar, Ranidu Lankage, Rene Reinsburg, Robin Chan, Ruchi Sanghvi, Sam Altman, Saurabh Gupta, Scott James, Steve Jang, Sujay & Sheel Tyle, Tikhon Bernstam, Travis VanderZanden, Wayne Chang, and Wei Guo.

Whew.

You get all that?

Ok, so the question is, why would Atrium LTS bother raising money from so many different stakeholders? Why not just get a few large checks from a few notable investors, instead of lots of small checks from a bunch of VCs and angels?