The only add I can include is; what good is fighting hard for a piece of nothing? You aren't going to milk much out of this as it is.

Stay on good terms! Maybe the idea isn't there yet, maybe it will blow up in 5 years. What if its the next Facebook? Do you want to be remembered as the asshole who fought over a couple thousand dollars in the beginning or someone fondly remembered, well connected with the owners of the new Facebook? :D