I completely agree and that's why I've always stuck with companies that make their own chips.  That 'rule' has served me quite well.  I'm not advocating for Peta-mine here. I'm just stating that others may be investing in a large IPO that will demand people sell other positions in order to invest.

However...

Asicminer:
  Currently having difficulty maintaining running blades.  In fact, in friedcat's most recent post he even mentioned that one of the reasons they aren't posting an actual hashing meter is because it would require them to perform more maintenance (leading one to assume they are laxed on the maintenance and letting people see that would be a problem).  This is further exacerbated by mysterious network issues that cause them to be unable to process all available transactions (losing fee's) and leading to orphaned blocks (highest orphaned block count of any mining pool).  These same 'network issues' are frequently friedcat's excuse as to why hashing seems to be going offline.  How hard is it to hire quality sys admins in China anyway?

Labcoin:
  Small time player with questionable trust issues.  Their stock price is already over priced considering the % of the network they will be able to realistically maintain being late to the game on old technology with limited funding.

ActiveMining:
  Complete silence from them is leading investors to lose confidence.  If you look at what they are offering and compare it to their competition, it's hard to see how they will make shareholders any profit with a 16GH, power hungry chip that realistically won't be out until mid November.

Given the state of available securities it is easy to see why people might be open to investment in a company like Peta-Mine.