3. Now you're duking it out with classical music fans (and only a percentage of them) and film score fans. Of course quite often to reduce our chances even further we like to mess with or eliminate the structure for good measure(pardon the pun) so we get moved further to the back of the popularity line.
I actually find ambient and classical to be very compatible musics with substantial overlap in certain areas (like longer form pieces with expositions that take some time (and patience) to develop, and elements of repetition and minimalism, or ambiguous tonalities). There's no reason for a listener to have to choose, unless you're making a desert island list. I think, though, that an ambient piece could suffer by comparison if not enough attention is paid to creating an interesting structure or form.