Yes, you are right, the BM6A are expensive.
But for getting good bass you need a decent Bass drive (6"-8").
If you compare, e.g., Dynaudio BM6A, Genelec 1031, Mackie 824, they are
quite similar physically, and price is almost the same. Take into
account that they are bi-amped, so its not just the speaker.
When I bought them, BM6A's where the less expensive of this set.
Although I also had to sold my soul for getting them.
Monitors are rendering physically the music, so they are critical in any musical
experience.
And listening music is one of the things that I most enjoy, even as much as
playing it. So I'm not considering just how they will help me to make a good
mix, which is important. The key for me is how much they help in
having fun whith both my music and the music from others. If you
have a good music intrument (which all of you already have),
you need something that let the instrument show its tricks.
Well this is all the crap that I tell to myself when I need to alleviate my sense of culpability.
Probably I will be also happy with something less expensive.