In terms of no right answer...yeah. Depending on genre, media, yada, and yada...the factors would be numerous. Industry standards for a "first time" actual novel vary.
I have seen a low of 65,000 and a high of 100,000. I believe 75,000-85,000 is optimum.
To answer your question...when would I feel ripped off? Probably after getting the Kindle and realizing I didn't know how to make it work. That's me, though.