To be fair, when you add up all the money spent on Kerfoot, Jarnkrok, O'Reilly, Knies, Bunting, and Acciari; it's $10.6m on 6 forwards. That's really not a lot.
Have to agree with your bolded point as well. The Leafs have spent years shuffling the deck chairs around these 4, and gotten no further ahead. Even this year, yeah, it's great that they got past the 1st round and knocked off Tampa... but let's not forget, they were outplayed in the series. They ran into Vasilevsky who was apparently playing hurt, and knocked our Cernak in game 1.... despite that, they needed 3 OT games to get past Tampa.
Of the 5 games they won and 11 they played; there was only one that they actually pulled away in... game 2 against Tampa. You look at Carolina's playoff so far.... against New Jersey they won games 5-1, 6-1, lost 8-4 won 6-1, and 3-2 OT.
I'm not so much convinced that it's a cap problem, as much of a culture problem, where everyone just expects these 4 to take over the game. Keefe probably perpetuates it by constantly trying to stack 3/4 together on a line... and considering Keefe is coach #2, I'm not sure a coaching change can fix that.