Size of the fan community

There are no hard statistics on the actual number of active Ars Magica players, but John Nephew did post the following on the Atlas Games forum in response to a fan's question (on 16 March, 2009):

Well, as a privately held corporation, we don't as a matter of general practice share detailed sales or financial information with the public.

In terms of supplements, I'm comfortable saying that we have typically printed 1,000 to 1,500 of each Ars Magica 5th Edition supplement on its first printing. Numerous supplements have needed to be reprinted.

The core rulebook needs to be printed in larger quantities, both because of higher demand and also to make its 2-color interior printing affordable. Today we are down to the very last case of the second printing, and the third printing is due to arrive from the printer in the middle of this week, avoiding any out-of-stock time between printings.

I hope this is enough to satisfy your curiosity. :-)