They can sue for cyber squatting and they will win the name spending only lawyer fees (maybe they can skip that as well :P). If anyone is supposed to be reasonable it should be us, yes, us Domainers. We can't expect to hand register the name that a business has announced publicly then think we have a landed a million dollar domain. Give it a thought, put yourself in the shoes of DSP, and consider would you pay for the domain name or file a case. You might want to consider an attorney as business' always consult their lawyers for such matters
There are cases where small business have won such trademark issues. For example nissan.com is owned by a computer company and not Nissan Motors. They have also made the case details public so have a look into it. They won it because they were clearly using the name for a product totally irrelevant to Nissan Motors, and they still do.
It was not your idea, you are not putting millions of dollars into setting up the business, you are not working to bring people together and get the business alive and running but you simply take their idea, spend $10 or less and expect to get a $1m for your what effort? Think reason.