You also must apply for a permit – or risk being arrested if you are caught climbing without one – and there is no guarantee of getting that either.
Not everyone who wants to climb the mountain gets the option either. Price and schedule are the biggest limiting factors. Hiring a guide is an expensive undertaking, especially with no guarantee of success. You also must apply for a permit – or risk being arrested if you are caught climbing without one – and there is no guarantee of getting that either.