No, that machine is definitely not worth $200. The table is in horrible condition, and the machine probably is as well. Something was spilled on the table at one time. It's stretching it to say it's worth even $50. 15-91 machines are very common, keeping watching. Another one will come up eventually.
You 'might' email this seller and tell him your thoughts on the machine. And then offer $40. Use some of the comments from here! The worst he can say is no, right?