I have been in the position of trying to sell the idea of unit testing to management and stakeholders far too many times. In five years time we'll all look back and laugh. It must have been like trying to sell regression testing a few years ago.
Why is quality not a concern? Show me a software company who does not unit test and whose managers are against it and I'll show you a company with unreasonably long release cycles and bad technical debt issues in a fragile code-base. As a seasoned developer and architect unit testing is a given and mandatory for quality assurance reasons, no arguments.
And then there's financial software. The only other kind of complicated software I can imagine where automated testing is more important is life support machines.
There is no such thing as a small simple Financial application, it simply isn't feasible nor possible to manually test all permutations in a large system. Would you trust your money with a bank who isn't thoroughly testing their product to manage your money? I know I wouldn't.
More importantly if you choose not to Unit Test when all your competitors are, your business cannot hope to compete with their agility and quality.
Many studies have been done showing unit testing actually helps software projects meet deadlines and reduce expensive (and sometimes product destroying) bugs in production.
Check out
http://www.agitar.com/solutions/why_unit_testing.html and my previous
posts on this.
