At the bare minimum, wouldn't you have deserved whatever the discrepancy was between the below-market salary they offered you and the market salaries you could have gotten elsewhere, aggregated over the years you were at the startup? I'm guessing that would be more than $8k in total.
You also had to deal with the post-acquisition career turmoil of either losing your job or having to work for the acquiring company, neither of which would have happened had you taken a market salary at a larger company.
