Reasonably confident that Black Knight wouldn't earn well at my main location (barcade, lots of players in their 30s). The loop shot is fun for a while on BK2K and the music is awesome, but if it earned well I think you'd see it more often on location. Although Black Knight was groundbreaking for the time, the rules don't hold up at all. With a rules rewrite, it could turn into something I would enjoy playing.
Dialed In earned poorly for me relative to the price tag. It earned only a tiny bit more than stuff like Fish Tales and Congo (even at 75 cents for Dialed In vs 50 cents for the B list Bally/Williams games). I love the game, but who is going to choose that over Game of Thrones, Ghostbusters, or Addams Family? Only the real pinheads.
Dialed In scarred me a bit regarding original themes. Took me a long time to try out a TNA but it's only been out about two weeks, so too early to tell.
Sad to say it, but for operating NIB, theme is almost all that matters in terms of the cashbox. If you want to operate original themes, save your money and buy stuff from the 70s and 80s for 1/4 of the cost.