Maybe you think yoga will benefit you in terms of helping you improve your health and flexibility. If you want to do yoga, then you need to buy a yoga mat.
Can you do yoga without a yoga mat? Of course! But how much is a yoga mat? How badly do you want to do yoga? How quickly and optimum-ly do you want to benefit from your yoga sessions?
Often, our willingness to invest is simply a reflection of how badly we want it.