What was previously impervious to copyright infringement, can now be easily copied. Illegal of course, but so is copyright infringement according to current laws.
You were just planning on selling the company for $5 million. But now, an exact copy is available on a site outside of your legal reach. They are able to do everything you do.
Will your potential buyer still offer you $5 million? Would you say that your pirate wasn't going to buy your company anyway and couldn't afford it, so he does you no harm? Your product was proprietary and hoarding data of users, he claims to be open and free. He claims that you are your code and ideas should belong to everyone, and you already got enough money from your first $2 million investment; asking for more would be greedy.
To me it seems that the only difference is that cracking a SaaS app is generally not technically possible, while removing the DRM on an installed app and then redistributing it is easy.