I think that, as a principle, it should be prohibited.
First of all, some nolifers have already accumulated incredible amounts of gold in crpg, and this would give them unfair advantage over new players, or over others that didn't grind as much. For example, the biggest crpg nolifer, Kesh, offered crpg gold as a reward to mercenaries against Mercs. Well, that didn't help him much, but as a principle it is unfair, because he is in possession of millions, while others may not have that much to spare. Off course, reward last night was only 10 000, but what's to stop him (and others) from offering 100 000? Now that would be tempting to some, wouldn't it?
Second, I would strongly advise against any solutions that would encourage grinding fest on battle and siege servers. No need to explain why, I hope.