I don't get the reason why Sony and Marvel can't just work together. there would be many perks for example: more marvel comic movies would be made. Not just that but, we could see spider-man in the avengers. Could you think of any other good things that could come out of Sony and Marvel working together.
Well, they would have to split the revenue. Spider-Man can make as much money in a solo film as any individual Marvel character.
So that means before it's even considerered, you have to assure Sony that the movie would absolutely make double what a normal Spider-Man movie would make (750M$x2=1.5B$). Then you have to consider Marvel. They can make that in an Avengers movie WITHOUT Spider-Man, so why on Earth would they cut their profits in half just to include him? Also consider letting Spider-Man sit at Sony gives Marvel hundreds of millions of dollars in royalties by doing pretty much nothing.