If you don't like the idea of spending a few hundred dollars to keep your septic tank clean, consider the alternative. If you fail to properly clean and maintain your septic tank, it cause parts to fail or break, which will require even more money, especially if you need to replace the system completely.
Another reason maintaining your septic tank is worth the cost is because it affects the value of your home. If you neglect your septic tank, it can cause the value of your home to decrease, which will become a problem when it's time to sell. To entice buyers, you may have to end up replacing neglected septic system.