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As we like to say here in Silicon Valley...if you want loyalty buy a dog.
Don't make the mistake of assuming your work relationships are real. Corporations do not have hearts and feelings - they focus on the bottom line - as should you. Your boss may be a great guy - but he is a lousy business person if he can't figure out how to make a saleable product. Emotional intelligence does not equal business smarts. The fact that this flailing business is so dependable on you is also a sign of his poor business acumen. A VC once told me that given a choice between investing in a company with great technology and mediocre managers or a company with mediocre technology and great managers, they would always pick the great managers. You have neither. Run while you can.