
If you can buy him out for $600, than I`d do it quick. But I would probably consult an attorney first so there are no problems later.
Board of Directors do "do something". In the real world, they challange the CEO/President as to the strategic decisions they are making. But as you see in many large corps, they usually rubber stamp the CEO and their actions.
There is nothing wrong, especially for a young growing company to have what I would call a Board of Advisors. Not Directors. Find 4 - 5 successfull business people that you know and admire with varying skills (marketing, accounting, operations, etc) and preferably in different industries/ markets. That way you get a nice cross section of knowledge and advice.
And don`t just pay them to be there. They should want to help you. If you want to reward them, come up with some token arrangement based on performance of the company over 3 - 4 years. And certainly not 20% of the company. And it`s OK to invite them out of the group if they don`t add value or constantly blow you off.
Hope this helps.