Sounds very much like an US point of view. Ever been travelling in Europe before the Euro (or in a lot of countries still without Euro)? You will quickly learn that small amounts of money in any obscure currency but your own is useless - which is why e.g. services like Paypal exist that take a lot of smaller payments to convert them to whatever they need to. If you go to the US and try to buy a burger with a 2€ coin, good luck with that. I still have about the equivalent of a few EUR in foreign currencies lying around at home (I think USD as well) that are completely useless, as I can't exchange them or buy anything with them (even mailing them to that country would cost more than the money's worth).
Having useless stuff lying around actually has opportunity costs and as this beggar can't expect to ever use the 5$ bill, he's better off not taking it at all than having to store it somewhere and maybe even getting into trouble with his colleagues or anything else. Same with Wikipedia - if they don't accept BTC, accept that! Even if you put up 1 BTC in escrow that has to be claimed by them, there's probably too much hassle or overhead to get it converted to something they can use. Since services like BitPay offer to pay in USD instead, just do that or stop demanding to pay someone with something that's not usable to this person/entity.
If I decide to donate to you 5000 litres of milk (which are also worth something) you'd also try to sell it (which might be in some cases as hard as selling Bitcoins) and have BTC or USD or EUR or whatever and have great trouble with that instead of enjoying the great gift of fresh milk you've gotten.
I can't understand why people just need to tell other people off about their opinions!
The point I was trying to make, which was obviously missed, is that if someone is asking me for something, I expect THEM to go through all the trouble to get it. If they can't / won't then, just as I already said, too bad for them. If this kind of attitude does not address your "accept that!" and "stop demanding" statements, I marked in bold quoting your answer, well, I can't be more clear than that.
Although your point about the beggar is quite correct, I don't find the way you communicate it by jumping on others, nice or polite. I think your response was directed to me and not the community, since I was quoted and that's why I'm responding to you. And BTW, it's funny that my point of view sounds like a US one, although I was born, raised and still live in Europe
P.S. To possible trolls: I won't reply to posts like "cry baby" and "whining" etc, so don't bother.