In a word, yes.
Honestly though, I'm not sure it is as great a buy as it would have been last month. We are starting to see graphics card prices come down. On top of that the next generation NVidia cards aren't too far away. Also add to that AMD's Navi on the roadmap pretty soon and older cards might not be as good value as they have been. Now, the 780 Ti is pretty much dead even with the GTX 1060 6 GB, making the price a great value, however, you are getting a card with limited support left to it and probably no warranty. Performance per dollar is DEFINITELY there, but it is an old card. It may or may not have a lot of life left to it. So, the longer we go on the more risk and less reward buying used cards has for us all.
Right now...