Sources:
Who Killed Kurt Cobain? (WKKC?) – Ian Halperin & Max Wallace
Heavier than Heaven – Charles R. Cross
Kurt Cobain – Christopher Sandford
Never Fade Away – Dave Thompson
Beyond Nirvana – Hank Harrison
Cobain Case Study Manual – Tom Grant
Various Police Reports

In any investigation the primary matter is the motive behind the alleged crime…
To establish a foundation, Courtney and Kurt had not been getting along. They'd been talk of divorce, and tension in the marriage as confirmed by many who were close to the situation, including Rosemary Carroll, and reflected in numerous police incidents. Kurt did not want to tour or perform anymore, it was speculated just before Kurt's death that Nirvana had indeed finished and Kurt wasn't interested in the renewal of his contract with DGC, which would shortly expire. He was walking away from what was a $9.5 million dollar contract to headline the Lollapalooza tour - "This decision that he had made was going to affect a lot of other people. He was no longer the money machine that he once was." Therefore the motive is fundamentally money driven, by someone who wanted to retain and increase the value of his records, and capitalise on the Cobain estate.
If Kurt was planning to boycott these unions, he was a free man, and if he wanted, could be powerful and influential against his current situation... The ramifications of this meant Kurt was on dangerous ground, "People have been killed for less... the industry needed shooting and Kurt was the man for the job"

VH1 Behind The Music 1994; "Buried with Cobain was the alternative rock revolution."
"There was a real sense in the air that we were going to take over the world...There was a real utopian sense that it was just going to get bigger and things were going to change and the rules were changing and the music industry was changing - and by the time I got to the end of that year I realized that it was a total sham. People were going to make their money, exploit it and just move on, and that's exactly what happened...Kurt's death, from a community point of view, just seemed to take the wind out of everybody's sails." - Billy Corgan

"Kurt by this time realized that his wife and the corrupt aspect of the recording industry were one and the same. He realized, too late, that Hollywood was a whore and he was married to it. He wanted, therefore, to divorce both Hollywood and his wife in one symbolic upchuck." - Hank Harrison

“Ultimately his largest problem in life was not being able to say, "Fuck you." "Fuck you, Courtney. Fuck you, Gold Mountain. Fuck you, Geffen - and I'm gonna do what I want." - Courtney Love

"A big 'fuck you' to those of you who have the audacity to claim that I'm so naive and stupid that I would allow myself to be taken advantage of and manipulated." - Kurt Cobain, Incesticide liner notes.