it's very normal for prices to drop. you'll find that most bounty holders will drop which in turn drops the price but you tend to find people that have been following the projects then buy in at low prices and look at holding longer term until the prices stabilise.
If we analyse the equity markets then you do find a trend, however stock exchanges are looking for illicit activity and have the correct surveillance methods to identify this, limits, circuit breakers and lock in periods are useful tools to balance the equation
In my view the ico market is opening up general investors to a real world of amazing possibilities, correct due diligence coupled with a business outlook can help pave the way