0. BTC/??? pairs loosing BTC rate due to huge BTC uptrend

1. VTC didn't lose USD value. It's even stable because BTC rise is fast and a furious. Now VTC coming up a bit.
2. Scrypt coins loosing ground due to to massive ASIC dump
3. A lot of coins just disappearing
4. Some coins are stay the same BTC rate or artificially rising due to successful PoS multipools and coming back again every day (where VTC also mined as profitable coin).

Look at buys on craptsy and mintpal, whales and investors with money are not idiots.