Price relative to what ? Relative to USD many alts rose along with Bitcoin simply by holding their ALT:BTC price.
Bitcoin as it lifts capitalisation lifts the value of the entire crypto market then once the rise stabalises that new Bitcoin money seems to help the ALTs
If it was draining the ALTs they'd be drained dry by now, BTC has had a good past 12 months added more market cap this year than the entire ALT market value in Jan 2017 probably.
I might say that your comment is the best from all others! Who
ever follow price charts will notice that in dollars almost all alt-coins
are going up with bitcoin price. In bitcoin price almost all alt-coins
are losing value, but some of them rising in bitcoins too. I noticed
that Dash is gaining value and yesterday IOTA, Waves, and few
others, it would be too much to mention all others.
This bitcoin rise made many people to transfer funds into bitcoins,
that is why demand is high and price is rising. I believe that alt-coins
are here to stay and money will come back when bitcoin keep some
steady price.