Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
no. if you are using these for gaming then definitely not. there arent any games that i know of that are coded in 5.1, if you are using them for a HT set up then ya, some dvd's come coded in 7.1
It's not just the fact it's "more speakers" when you look at the position you actually place the speakers you can kind of see the benefit. instead of left/backleft'ish you have a distinct left and back left... it's makes a big diffference being able to accurately tell what direction a sound is coming from... It just adds an extra level of immersion, it's actually helpful in CS:S and probably BF2 if I'd actually play the game. (But 7.1 directional audio is supported in quite a few newer games)
If you're just listening to like... music in Empire Earth or something.. then.. don't bother, 5.1 can fill your space just as well, or well enough where you really shouldn't care
As to the movies comment... yes a lot of movies have 5.1.. there are no movies I know of encoded for 7.1... the best I know of are a small handfull of movies with DTS ES.. which is 6.1 (6.1 has a single channel in the rear, opposite your center, otherwise it's just like 5.1)
You can of course use something like Logic 7(HK) or Dolby Pro Logic IIx to extrapolate audio into 7 channels.. but that's just a processor doing it and not really someone's audial intention.
Majority of music is 2 channel with a few exceptions now encoded in 5.1 audio (on dvd-audio discs and super audio cd's)