BREAKING NEWS: HubSpot co-founder/CTO buys $1.8M of his own company's shares. Disclosure 1: Yes, I'm that guy. (And no, I'm not used to talking about myself in the third person -- will not make a habit of it). Disclosure 2: This is not investment advice. Please do not buy or sell $HUBS shares based on this. So, why am I sharing this and writing about it? Well, for one, at least in my little world, it's noteworthy. It's been a while since I've bought HubSpot shares (I think it was back in…