Hopefully I'm not giving anything confidential away, but the answer is pretty straightforward:
Buffer was able to prove that they can convert x% of their users to a paid service, with a very viral, rapidly growing user base.
They proved that they could build something people wanted, get people to pay for it, and market it in such a way that it grows virally (keeping their costs low).
As an investor, that would be music to my ears - their burn rate is likely to be completely covered by the CURRENT revenues, and the rest is gravy. They have all the time in the world to figure out what additional services people want layered on top of their social media, and have proven that their team can both build and market their new ideas.
Buffer was able to prove that they can convert x% of their users to a paid service, with a very viral, rapidly growing user base.
They proved that they could build something people wanted, get people to pay for it, and market it in such a way that it grows virally (keeping their costs low).
As an investor, that would be music to my ears - their burn rate is likely to be completely covered by the CURRENT revenues, and the rest is gravy. They have all the time in the world to figure out what additional services people want layered on top of their social media, and have proven that their team can both build and market their new ideas.