Ok, let's look at this one step/para at a time.
1. Two things on this. Firstly, if you didn't have the PRS money would you just stop eating and die or would you cope? I've lived on very little money, and survival isn't an issue, I'm sure it's nice having the extra cash, but I would expect you would be just fine without it. Secondly, do you honestly think you will see any of the extra money that the PRS makes from Google?
2. You're not giving permission to "improve productivity", you give permission to listen to music, that's all. If it improves work, so be it, but that's nothing to do with you, for exactly the same reason that you don't pay your landlord extra when the street is quieter than usual outside your bedroom window, letting you wake up better and be more productive in your studio. You've already asked someone to pay for the performance when the radio station paid for it. Get over the fact that you can't charge everyone who listens to your music, however much you would like to. This is the reason that the extortionate figures quoted in p2p trials are ridiculed, there's no guarantee that anyone at that workplace wants to listen to the music, or that every song played increases productivity, they might just have read a technical manual the night before. It's arrogant to assume it's because of you that the productivity has increased, which is what you are doing.
3. Where did you get the 95% figure? I would assume the majority of the number is made up by the unpaid section. That's a problem with the system, and kind of reinforces what most people are saying, that the system currently just doesn't work and needs changing. 'Google, took $5.7bn in revenues for q4 2008 and I'm supposed to give them my music for free because it's good "promotion"'. No. The issue isn't with user-uploaded music, it's with the Premium videos which have been uploaded specifically by the record companies. YouTube already pay royalties for them, the PRS is asking for more. You've spectacularly missed the point, however, for clarification - if you got a decent paying job would your landlord ask for a higher rate? Also, promotion is everything. It's what record companies spend most of their money on, because without exposure you won't make any money. If you're not making money, it's possibly because you're not any good. While it's easy enough to do, most people will not grab YouTube content, or download tracks illegally, but will, if they like it, either purchase the track as a download, or even better, order your album. If you're not making any money out of that it's not YouTube's fault, people are still buying your stuff, you're just getting shafted by the music industry, which, once again, is pretty much what people are saying already.
4. That's not a logical conclusion. YouTube already pay for the music, they're being asked for extortionately higher amounts of money. It's like making a film and using your music, then when the film studio has made huge profits on the film, asking for much more money. It's stupid.
Quite frankly, I find you arrogant and naive. Even if you're music is good I can't see you doing too well, simply because you come across as abrasive.