OK, I am going to chime in in regards to the weight of the LP's....Just like any other marketing tool, so is the weight of the LP.
The only advantage really of the thicker LP, is the elimination of some rumble (maybe) because of the mass...BUT, sometimes if you dont adjust the VTA, it wont sound as good. Also, thicker pressings seem nowadays (ask people who bought a lot of Speakers Corners, etc) heavier re-issues have QC control issues/ They take longer to press, and if not pressed long enough, they warp, develop bubbles, etc etc..
There are extremely quiet and excellent recordings in paper thin vinyl....EMI, Harmonia Mundi, Lyrita, Opus 3, RCA Japan, Reference Recordings, MFSL, Sheffield, Philips, countless Jazz labels all use very thin vinyl and they sound incredible!!!
So basically the heavy vinyl is just a throwback to the old times, when arms and carts were lots heavier, and the production runs werent as massive as it became later. Its nice to feel the heft, but I dont think it makes a difference...
Also, digital recordings that are not remasters, but originally recorded with PCM or SOundstream systems sound darn good to me,,,their DAC's were eons more effective than what you get in CD players...