[I M G ]http://i64.tinypic.com/dh4xx.jpg[/img]
Source: (https://coinmarketcap.com/charts/#dominance-percentage)
Any ideas about why this is happening?
If you have checked, history is just repeating itself. The fact the prices are booming in bitcoins, investors are moving away from altcoins. Then if bitcoins are going down, they are all buying cheap altcoins. It's like a seesaw, when one falls the other rises. This has been the case for a while now. You'll see when prices go down in bitcoins then altcoins will again rise. So this is the best time to buy those cheap alts.