I think the reason is that people took so much Bitcoin out of the exchanges to get their Bitcoin cash that currently there's scarcity of it in the exchanges. After they started dumping BCH for BTC, BTC went up. The ICO's that had suffered dips bellow the ICO price recovered and gained 4x-10x returns. Then people started trading the projects close to the 100 top coins to pump and dump. Other coins with projects without news in the close horizon just stagnated.
That summed with the new of people on the news talking about how Bitcoin can get 5% of all the market for gold has people saying the price is gonna go to $10.000.
This could go very well to $10.000 smoothly before it falls over the next 6 week unless there's a problem in Segwits public implementation on August 23 or in November with another split. The couple of ICOs I invested since July have given me 10x returns. So I sold 35% and went to Ether and cash (with a small amount of BTC and BCH). If bitcoin goes 3x, that's nothing compared with it falling and dragging everything else with it.
I think bubble price to be close to $25.000