How is it a great deal if its a weight you don't throw?
What kind of a question is that?
He obviously got a great price on a 16#. It's not rocket science.
The OP answered the question after your post, but I think that was a legitimate question. When someone is looking to drill out half a pound, for many it may not have been that great of a deal in the first place. (But according to him it was since he can use 16#).
There are many bowlers who prefer not to use a ball that is a pound different (usually heavier) from their normal equipment due to either strength, health or timing issues. Although I used to throw 16#, there is no way that I would consider buying one now, no matter what the price.