You know the saying: the only secure system is turned off, in a safe, in a bunker, deep underground, guarded by 200 men. And even then I wouldn't be so sure.
Anyway, I'm not sure that the idea that because FreeBSD is used by few people there's a lack of value in compromising it
I would think that most intrusions to home computers are of little value other than collecting nodes for a botnet.
I've known a lot of people over the years (who use MS-Windows) and not one has ever reported their bank account as being compromised, for example. I suspect that it is very few that get pwned in that way.
Can be very few people, but apparently more than enough