I took a look at my router yesterday, as you do, and counted 14 devices connected over WiFi and 4 over Ethernet.
WiFi included 4PCs/laptops, printer, 4 android phones, iPod, iPhone and iPad. Ethernet included my laptop, a VoIP phone and a couple of homeplug devices that hook up the XBox.
That’s not SoHo. That’s a small business. We certainly have the overheads:)