I've never bought a BP online, but I did purchase two hognose. The seller was wonderful, answered all my questions about what they were eating, how often, temperament (which was important to me), and a whole slew of other questions. IMO, if it's important enough for you, it should be important enough for the seller to answer. If they really care about their snakes and their potential homes, good sellers won't hesitate to answer your questions.

On the f/t switch, it never hurts to ask