BVM doesn't have a clue what he is talking about, as usual. BF is a great machine. The large display is pricey, and the issue with these segas that had it. I have a new extra one I got off a guy on RGP when I had a BF for a back up. I keep meaning to sell it.
I bought it for $350, you can have it for that plus shipping if you want it. I was keeping it for another large DMD machine if I came across one, but that is unlikely at this point. I believe through MAD is $450 plus tax and shipping. For an extra $50, I'll throw in another one I have with two lines out and some minor gassing. That should keep you safe for a long time.
As for repairs, if there is a line or two out, that is one thing, but the repairs would still like be $100-$200. If it is gassing, there is no repair. Even with a line out, it may be in your interests to buy another anyway, as I don't expect them to be available for too many more years.