Skimmed through a few seconds of The Patriot on here. Unfortunately the quality was not very good, and there are no resolution options like normal YouTube video

Skimmed through a few seconds of The Patriot on here. Unfortunately the quality was not very good, and there are no resolution options like normal YouTube videos. Are they all this bad? Why can't we watch movies at the same quality we get on cable TV? Ad revenues are that much lower, or are the studios just clinging to old business models?