Why Blu-ray for SD quality shows/movies

[BJMRamage]

OK, I am new here. I actually have yet to install/mount/connect teh HDTV and Blu-ray, etc. So, that in mind, please bear with me...I tried searching but got no results and maybe used wrong phrases.

Why would one want a Blu-ray Disc over standard DVD for old movies or old TV shows? (I read and can understand TV series being on less discs and making it easier that way) But with upconverting DVDs how would a movie, like Taxi Driver or Bullitt be any better with Blu-ray than a DVD? Is part of it to have BD-Live or other content or keeping Discs in a similar package size?


Also, how many of you have gone out to replace your DVD collection with BDs?And do some of you just purchase a DVD in place of BD if the movie is ok, or not really "worthy" of HD? say a comedy that doesn't have a great audio track or noteworthy cinematography?


Thanks in advance, again I am new so take that into consideration.