That is a dangerous mind set. Always pull more lines than you think you need. ALWAYS! I can't begin to tell you how many times you pull just what you need only to find out that you need just one more. Materials are cheap and the labor doesn't change if you pull one, two or more lines. If you need one, pull two. If you need two, pull four. If you have a line that fails or a need that you didn't anticipate, you're covered.
The likelihood of a LAN cable failing is extremely low. Plus if it does, it really isn't hard to re-pull it using the old wire.
The cheapest I found CAT 6 plenum rated cable is $0.30/ft (if you buy 1000ft) which isn't breaking the bank, but it isn't cheap. Certainly not if you're doubling what you really need.
Again, I'm curious to know what people are running where they need more than a gigabit of bandwidth simultaneously in one room? Almost no one has gigabit internet yet and most gaming consoles don't come anywhere near that speed so the only thing I can see is if you were copying huge files between multiple computers where you would actually saturate a single line. That scenario can't come up too often.
Plus, if you're using a switch you can never run out of ports so that comment doesn't make sense. If you think you need 3 then buy an 8 port switch. If you need more than 8, then I could see running more than one line, but can't imagine a scenario (in a home) where someone has 8 devices hard wired in one room and is operating them all at once.
Edit: Also, if you're using Cat6 that supports 10Gb bandwidth so you could always get a higher speed router and switch when the time comes.
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