It's Saturday. You're not working at your store today, but an employee is opening and running the store for the day - but there is no Internet connection!
WiFi does not help your consignment software one bit. At home it seems like a great idea. No wires, no mess and it's just very convenient to be able to move around freely. Your consignment software is different. Consignment software is "high-demand" software in that, it relies on a connection/path to the database. That connection must be there 100% of the time while the application is running. Any network drops or disconnects can and will cause your consignment software to generate program errors.