The ETHPoW (IOU) token, which was created in order to counter Ethereum’s future transition to proof-of-stake, has seen its price drop by over 50% in less than a week. This is likely due to the lack of support for the fork, as most people seem to be content with the proof-of-stake.
After some time, this token may lose in value much more because it does not and most likely will not have community support. It makes absolutely no sense to invest in such tokens, especially since Ethereum has not yet switched to PoS. In my opinion it is much safer to invest in ETC.