Currently subscribed to 100Mbps TIME internet. Because of my unit's arrangement, I need about 30m ethernet cable to position my router in my room. I was told by the technician that they are still using category 5e ethernet cable which is a very old cable technology by now.

I plan on buying category 6 ethernet cable to replace the current 5e cable but category 7 cables seem pretty decent as well.

My question is:
1. Is category 7 cable worth it? Or is it overkill?
2. Should I just stay with category 6 cables? Will there be any improvements if I go for category 7 cables? Seems like they are being used in networking centers only.
3. Why are most service providers still using category 5e cables?

Thanks!