There's also a certain element of "In the vanishingly unlikely event the IRS audited us, disallowed every expense our employees charged in the year, and then charged taxes on those plus the standard penalty interest, that wouldn't cost us enough for us to even notice it."
While I agree with David for the most part, his cavalier attitude of "Well, if we get audited it will be cheaper than the cost of tracking shit" is naive. Once he goes through an IRS audit, where they turn everything upside down and consume hundreds and hundreds of hours of time then he might change his attitude of the cost of an IRS audit. They are not nearly as cheap or insignificant as he makes it out to be.
PS: She did still took many large deductions and had reasonable records, she just played it safe when submitting her taxes.
If you get audited, you're in for tens of hours of annoying drama no matter what (in reality, it's your accountant that's going to do all the work).
If you're writing this on the assumption that a small business might handle an audit (or really even simple tax returns) on a DIY basis, get that thought out of your head now. You need an accountant at almost the moment you start seeing revenue in your business.
Acceptable risk and cost of running the business.
I'd say that kind of refutes this post entirely. Having the right people do a job is a good thing :)
I put my thoughts in a post above, would love to hear what you think.