I buy strictly by author. I couldn't tell you who publishes Nora Roberts or Jayne Ann Krentz. I know Baen publishes Lois Bujold's Vorkosigan books (because I'm breathlessly waiting the eARC of Captain Vorpatril's Alliance), but couldn't tell you who publishes her fantasies, except that it isn't Baen.
I do tend to avoid Harlequin, because they publish category books which (except when one is highly praised at Dear Author) I don't buy because they usually don't have enough plot for me. There was a time when I'd look at a historical romance that sounded interesting and realize it was published by Avon, but I didn't go looking for Avon books.
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