Define "into amateur astronomy". Sky & Telescope (US version) and Astronomy Magazine have about 200,000 subscribers collectively (both have dropped quite a lot in recent years). Add the Europeans/Asians and those who do not subscribe to a magazine and I think Leon's estimate is spot on. However, it is true that we are a niche group. Even hobbies like remote control airplane flying (my father's main hobby) are much more popular than astronomy, let alone something common like birdwatching.
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