What is it with tribute bands?

I'm not trying at all to yuck anyone's yum, but I would like to know what the attraction is to tribute bands? Seems like the Clyde has them every other week, and a LOT of people show up to see pretend bands.

Sure, they may be good and reasonable facsimiles of the OG, but it still isn't the OG...why would you pay money to see a pretend band?

Last night was AC/CD and Black Sabbath, I think. The line was long, the parking lot was packed as though those bands were actually at the Clyde.

I'm just asking a serious question...why do you like tribute bands?

(I define "tribute" bands as those that dress up like the OG and play the music exactly like an OG recording. A "cover" band has more license to make the song they are covering their own...plus cover bands play all kinds of artists, whereas tribute bands play just the music of the band they are a tribute to)