To upgrade a special edition dvd to bare bone Blu-ray, yay or nay

[Cradle Of Fish]

I noticed some Blu-ray movies are bare boned. Example Jay And Silent Bob Strike Back. A commentary or two and nothing else (that I noticed, haven't got it so I can't be for sure), yet the DVD I have is chock full of extra's. I wanted to upgrade to Blu but is it worth it? Just for better pic and audio? I don't think so, it's not like DVD pic and audio is bad, it is really good. I don't know. Are there more blu-rays out there that are bare boned give or take a feature or two compared to the extra filled DVD versions? And why even release the BD if it won't have bonus features? I guess some folks only want the movie and could care less about bonuses, that's cool, but I like to watch all that stuff.