I don't have this one. Probably never will, 'cause I have all the tracks on other albums. I looked over the tracks here, and they are all great - no surprise.

why don't they do a Best of Dylan that are not frequently radio-played hits?

I would enclude the following:

Baby, Let Me Follow You Down (From "Bob Dylan")
He Was A Friend Of Mine (From "Bootleg Series 1-3")
Don't Think Twice, It's All Right (From "Freewheelin")
Ballad Of Hollis Brown (From "Times-Changin")
Boots Of Spanish Leather (From "Times-Changin")
To Ramona (From "Another Side")
It Ain't Me, Babe (From "Another Side")
Farewell Angelina (From "Bootleg Series 1-3")
It's All Over Now, Baby Blue (From "Bringing It All Back Home")
Desolation Row (From "Highway 61")
Visions of Johanna [Live version] (From "Biograph")
Leopard-Skin Pill-Box Hat (From "Blonde On Blonde")
Sad Eyed Lady Of The Lowlands (From "Blonde On Blonde")
Million Dollar Bash (From "Basement Tapes")
I Dreamed I Saw St. Augustine (From "John Wesley Harding")
I Threw It All Away (From "Nashville Skyline")
Livin' The Blues (From "Self Portrait")
One More Weekend (From "New Morning")
Wathing The River Flow (From "GH Vol. 2")
I Shall Be Released (From "GH Vol. 2")
Billy (From "Pat Garret/Billy Kid soundtrack")
Dirge (From "Planet Waves")
Shelter From The Storm (From "Blood On The Tracks")
Up To Me (From "Biograph")
Simple Twist Of Fate (From "Blood On The Tracks")
Oh Sister (From "Desire")
Romance In Durango (From "Desire")
Senor (From "Street Legal")
We Better Talk This Over (From "Street Legal")
I Believe In You (From "Slow Train")
Gonna Change My Way Of Thinking (From "Slow Train")
What Can I Do For You? (From "Saved")
Every Grain Of Sand (From "Shot Of Love")
Trouble (From "Shot Of Love")
Licence To Kill (From "Infidels")
Neighborhood Bully (From "Infidels")
Blind Willie McTell (From "Bootleg Series 1-3")
Dark Eyes (From "Empire Burlesque")
Under Your Spell (From "Knocked Out Loaded")
Rank Strangers To Me (From "Down In The Groove")
Shooting Star (From "Oh Mercy")
Dignity (From "GH vol. 3")
What Was It You Wanted? (From "Oh Mercy")
Unbelievable (From "Under The Red Sky")
Jim Jones (From "Good As I Been To You")
Delia (From "World Gone Wrong")
Broke Down Engine (From "World Gone Wrong")
Highlands (From "Time Out Of Mind)
Not Dark Yet (From "Time Out Of Mind")
Things Have Changed (From "Wonder Boys" Soundtrack)
Lonesome Day Blues (From "Love And Theft")
Thunder On The Mountain (From "Modern Times")
Nettie Moore (From "Modern Times")

It could be a 3 CD set, and they could sell it for $29.99 (Unlikely). Of course I wouldn't buy it then either, cause I can make my own CD with these tracks. However, it would be a wonderful introduction to Dylan's best music that isn't heard all that much.