It is not just for strikes but for anything that is sold. You just have to keep records of all of your expenses including gas for the car, utilities (write off a portion for your home office), cost of goods, shipping, Ebay fees, PayPal fees, packing materials, etc. etc etc. I would start by getting an auto mileage log book so you can write off the expenses driving to and from the location to get whatever you selling.
Basically no more Hobbies. Everyone that sells in running a business. The only good thing is that if you keep records of everything you can write most of it off and pay less taxes.