The whole market reacted strange today, it went up by a lot of money, but it is now going down, it is very strange because we dont even know what is going to happen by tomorrow, but nobody can predict what is really going to happen soon.
But all those who invested on bitcoins or in altcoins before the fork, they are still holding those funds, and this is why the price is still at that price, because it is impossible to see it droping if the holders doesnt dump their coins, it is simple as that.
I believe the market continued an upward trend before it was announced that the fork would not be happening due to lack of agreement. It was at that point that people realized that they weren't really going to get anything out of the situation and tried to get the most out of their situation. Since bitcoin was in a bubble, I suppose that they thought if they sold right away, they could make some slight profits, which some probably ended up doing. As of now, it's likely that people are more at losses than anything else.