that is right. I started using nVidia cards as well.
The 1080Ti is good for ZCash. It is not good for ETH related mining.
GTX 1080ti is a good card on a hash/watt basis for ETH, but it is not good on a hash/$ basis.
Prior to the release of the Vega line, the 1080ti was the highest hashrate card you could mine ETH on with only a single GPU on it - and it's almost a match for the Vega64 on hashrate at MUCH lower power usage and similar cost.
1080ti is definitely better off on ZEC ZEN and related coins though, among other options.