Yes, it seems like a true addiction. I've gone through the same phases with Studebakers, hand tools, my Taig lather and its attachments, tube radios and amplifiers, and the list goes on. It IS the hunt thats exciting, and probably relates back to our early history.
To paraphrase the Buddha, "attachment(s) are the root of all suffering". I'm searching for more attachments because they take up less room ;^)
We're all in the same boat!