Bram Stoker once joked about "25 stations and 4 transmitters" regarding how the pirate scene actually worked. He's not far from the truth,IMO.
I actually try to distinguish between actual stations and what I call "novelty stations" in my own personal log list.
For Europe, it is easy. Yes, there are novelty shows for certain holidays, but they are rare. Also, some stations change names for "enforcement" reasons. And some stations adopt different names for holidays (particularly Christmas). Only two or three regularly use different names (one seems to have 3 names, one for each of his musical styles). But, overall, it is a lot easier to keep track of than this side of the Atlantic.
Over here, it is a bit of a mess. There are many "seasonal" shows that I know come from one guy, because I recognize his voice (and particularly his pirate "arrrr" ... he does it well

) whenever I hear it. There were the multicolored Rhino shows that obviously were connected. And the Blowing League occassionally try to make an impression with a bunch of new names. But overall, who knows how many actual txs are on the air

But it is all fun

, unless, as Chris mentioned,, they use those identities for other purposes

Cheers, Terry