I had an extremely similar experience, but I do have a beef with the founders for not compensating me fairly with respect to the work I did in helping them create something they could eventually sell to a large company. [Before anybody throws shade, the site was developed by a Flash dev, a Java team for webdev, and me building the backend and running things as a solo sysadmin.]
None of these people are your friends, get as much as you can.
None of these people are your friends, get as much as you can.