I was hoping to get some discussion on the question, but I forgot to include my estimates to get the discussion started, so here they are.
Active Classic Amiga Users = Less than 300 (that boot up often enough to fit the definition given in this poll).
Active Amiga-Like Users = Probably about 1,000 (that boot up often enough to fit the definition given in this poll).
Amiga Lurker's = I think there are probably still another 1,000 to 2,000 people, above the numbers for the two groups above, that are still interested enough in the Amiga to check forum sites, post message once in a while, and boot some kind of Amiga/Amiga-Like system once in a while.
With there being a lot of overlap between the first two groups, I am guessing that the total number of people still having any kind of active interest in anything Amiga is probably around 2,000 to 3,000 people (which is very sad). The number of people that are likely to spend money on Amiga/Amiga-Like hardware and/or software purchases is much smaller, probably 1,000 at the most. A very small market for developers and hardware manufacturer's.
@Ismart,
I would agree with your estimate for Germany being about 500 users that are still "Active", but I think that your 70,000 number is crazy. Remember that I am asking about "Active" users who boot up and use an Amiga/Amiga-Like system at least once or twice "every" week and use it for at least 15 to 30 minutes "every" week. Not just people that own an Amiga/Amiga-Like system and turn it on once a month or less.
The most active countries or areas that still have an interest in anything Amiga seem to be Germany, the UK, Poland and some other nearby countries, Australia, New Zealand, Canada, & the USA, with additional users still active in Spain, Portugal, Brazil, Mexico, Japan and maybe a few users in China. So, I don't think we can assume that if there are 500 users still in Germany (or a few more), that there are that many in all of the other countries that the Amiga was sold, as it was not as popular in the other countries as it was in Germany & the UK.