They are relevant because, for any given coin/chain, it seems to be pretty damn hard to hack the numbers. The only way to get some is to mine for a long time wi

They are relevant because, for any given coin/chain, it seems to be pretty damn hard to hack the numbers. The only way to get some is to mine for a long time with expensive hardware, or to convince someone to give you some by giving them cash. Turns out enough people have enough interest in the things that they don't give them up very easily.