I started doing leather out of necessity (needed a custom holster) but soon found that I enjoyed it also. I bought my first machine a little over a year ago my hands just couldn't take it any more, I found a used PFAFF 145 H4 for sale locally.
I have since purchased a Cowboy 4500 and could not be happier, I make and sale more then enough leather goods each month to pay for it and I have become the local go to guy for repairs also.
So Yes, I say Buy one!
I would read through this post, this guy knows sewing machines and saved me a lot of money and headache's, I am glad to have found it before purchasing any sewing machine.
Johnny