Ah, my favorite topic (not really): martial arts and money. If you want to learn martial arts from a commercial school, you're not just gonna pay for it in time spent and bruises. Memberships typically run hundreds of dollars per month (the minimum I tend to find is around $159 / month for adults in the DMV).
In my experience, what initially drives most people to part with a not insignificant sum of money every month is the school's content, and the belief that that content is helping them achieve their personal goals. This was what motivated me to join the various schools I've been a student of at one time or another. I wanted to learn how to throw people better, I joined a Japanese Jujitsu school. I wanted to learn how to grapple, I joined a BJJ school. I wanted to learn how to fight, I trained with an MMA fighter.
Somewhere in that journey, I got to a point when I realized that it wasn't just the content, the physical movements and techniques, I was paying for. To quote a great 20th century philosopher: "People can get a cheeseburger anywhere, okay? They come to Chotchkie's for the atmosphere and the attitude."
If you study a wide breadth of martial arts, you'll quickly begin to see that a lot of information repeats. Styles may vary in how they teach that information and how they wants students to apply it, but since all martial arts work with same raw material i.e. the human body, there is a lot of content repetition.
What makes these martial arts systems truly unique, truly special, is not the content, but the community of practice, the students and teachers who bring the content to life. If you're looking to get into martial arts, look for a school whose community is happy to be there, that supports each other and creates an environment that brings out the best in everyone. That's what you're really paying for.