SotF I think you are probably right, they were very popular so I imagine would have been a commercial success.... obviously not as much as their other lines though. WaHa pedia (I never go there honest) seem to rip off everything that GW ever print but even they have never done the historical stuff and they are pirates!
They were a success from everywhere that I'd seen them.
Legends of the Old West being a major one around where I live for a lot of things. I know that several people were also using it for a pulp type game.
Ancient Battles kind of came across as a game that worked well because a lot of people playing Warhammer Fantasy had them familiar enough to enjoy it (And a lot of Empire and Brettonian players could use chunks of their army), while being easy for the more historical focused players to get into.
A while back I lost a good chunk of my wargaming/rpg library due to a leak while I was out of town, been slowly replacing things...and when the games went out of print, people went looking for other games.