Technically wired connections are less secure as the data is not encrypted, therefore if you can splice into a cable you can syphon the data. Granted with WiFi the signal is omnipresent and can be intercepted, but it needs decrypted
Dude - what are you smoking? Cat5e is perfectly fine for gigabit networks, Cat6a is not the minimum and overkill for most home installs unless you are going 10G...
Yeah, sounds right. I put 24 ports in my 3 bed and used about 500m / 550m
You'll be surprised. We had our house rewired. 2 bedroom house and went through 300m of network cable.
One day they'll be as good as wires were in 2001.