Noise distribution has become smaller and smaller and a lot of people just sell directly. Very few distributors buy with money and also costs of shipping has effected greatly the trading. For me it appears as if new guys may have difficulty to get into "network" of older labels/distributors. That, plus there is vast gap between styles. Guy who knows, likes, and usually sells ambient, may not want to give a try to random harsh noise. And other way round.
There is division of sound/style, format and visual presentation. It may not be exaggeration to think that in some cases there are NO distributors. Lets say label puts out weirdo national socialist gabber meets dungeon synth CDR, and... well, reality may be that there simply is no distribution network for such material anywhere. Even amount of listeners may be almost nonexistent, and those who listen, may not be at "noise scene" per se.
I would say the noise distribution is all gamble, all about what type of stuff you put out, and in what ways you are in contact with artists, other labels and genren in a whole. It may require year after year work to build new network, since what is being done, is barely connected to former scene.
In my own case, I do trade and distribute wide variety of stuff. It still has to fit into overall idea what I feel could interest people who buy stuff from FA. To be stuff I don't personally dislike. If stuff is something I feel I could not honestly say to buyer it is worth of your money, I prefer not to have it. Even if it would have some sort of niche audience.
This is probably the reality now. Guy who cherry picks very carefully what to take and there barely are the old school "all things available" -distributors. Then you just have to adjust into idea that most guys who run any sort of distro, may not want your stuff, and may not have even time to check samples, as label + distro they do, is something what happens after work, on their limited couple free hours in a day. I would feel fishing distributors, same rules apply like bands trying to get record deals: Don't be opportunist just mass mailing whoever, but show your dedication to work by knowning who you are contacting and why. And not bother guys with desprate mass mails, who clearly have nothing in common.