To be clear to everyone who doesn't believe that this statement is true, what the CPA is telling him is that his hobby income is so small compared to his primary income that additional tax burden isn't enough to be concerned about.
Be careful following that advice however. It may not be a big deal when considering it for a year or two. If you fail to report that income, it's not enough to make it worth their (IRS) time to file any paperwork. However, if it accumulates over the course of several years, and then the come across something that points to it 10 or 20 years later, your fees and penalties will end up being 2X to 3X (or more) more than what you originally would have owed. These new rules with ebay provides uncle same the ability to go back and find this information at any point. Very frustrating how they will accidently overlook or loose information that shows you've paid all the taxes that you owe, but they are amazing and finding every little crumb that could point to money you didn't report. The IRS is a bunch of thieving bass-tards that have been tasked with the job of funding an out of control government. When possible, its always best to trade, or deal in cash.