I still can't bring myself to sell off any record from my collection, even the ones I don't like very much (at the moment). For the record, what albums are you planning to do away?
Let's see...
Michael Jackson - Off the Wall
Michael Jackson - Bad
Nirvana - Nevermind
Enigma - The Cross of Changes
Roy Orbison - Mystery Girl
I've got Greatest Hits collections of these and that's enough for me.
The Smiths - The Smiths
The Smiths - Meat is Murder
I love The Queen Is Dead but their first two albums bored me.
David Ford - I Sincerely Apologize For All the Trouble I've Caused
Nice but average earnest singer-songwriter stuff.
The Hives - Your New Favourite Band
Dandy Warholes - Welcome to the Monkey House
Nelly - Nellyville
Ok Go - Oh No
In & Out Soundtrack
Ash - Intergalactic Sonic 7"s
Pink - Can't Take Me Home
I bought all of these because I liked a single or two, but found the album pretty mmeh.
Silverchair - Diorama
Silverchair - Neon Ballroom
Whitney Houston - I'm Your Baby Tonight
Tina Arena - Don't Ask
Natalie Imbruglia - Left off the Middle
Liked them at the time but can't imagine ever playing them again.
Sigur Ros - Takk
Icecream Hands - Broken UFO
Gersey - No Satellites
The View - Hats Off to the Buskers
Got the albums mostly because of positive reviews, but just couldn't get into them at all. The View album was probably the worst purchase I've ever made (yes, including Be Here Now) but at least it taught me to never touch an album with Libertines cited as an influence.
There're also a few albums that I keep mostly out of geeky completism; I rarely ever play U2's October or Tori Amos' Scarlet's Walk but because they're my big favourite artists I'm strangely reluctant to part with them.