This might seem rude, but may I challenge any of those in this list who
are vehemently stating that the FOSS is the only sane route to start a
business and run it purely on the FOSS model?
FOSS is a software development methodology and not a business methodology.
You can structure the software development practices in your business
on FOSS. On whether FOSS is the only business methodology , I don't
think so. FOSS is both "Freedom to" and "Freedom From" . How you plan
on using it, it's up to the individual.