Massive savings and modability. A Hackintosh can be significantly cheaper and you're free to upgrade your disk, RAM and cpu.
Performance-wise a MacBook Pro is and has been a great machine and not incredibly expensive, plus you get the portability aspect. For the "semi-professional" market that a Hackintosh is appealing to, most folks would be better off with a MacBook Pro and a Thunderbolt dock. You also miss out on a number of core features of the OS because the hardware that supports them doesn't exist.
Combined with the headache of keeping the machine current, it's not really a good tradeoff for a couple hundred bucks. You'd be better off buying a used MacBook Pro.