I would like to live in Equal-land, I could live there, slouch around, work the absolute minimum and avoid work, and enjoy exactly the same benefits as those working the hardest to maintain that utopia.
Further, capitalism can't possibly be the solution to every problem. For example, capitalism will probably never take us "to the stars". There isn't enough money in it to cover such a massive expense. But yet, going to the stars is the only possible way to defend against the thread of a "planet killer" meteor/asteroid. The only time there would be money in it is when we knew such an event was imminent but by then it would be too late.