There will be risks when people offer third party DAC's. Even without fraud the reality is that the majority of new businesses fail.
However the beauty of PTS is that third party DAC's will be potentially honouring PTS with shares for free. So beyond your purchase price/cost of PTS, the risk to you is limited.
Personally I think the DAC's that they (BitShares/I3) will be heavily involved in creating themselves, makes PTS an attractive buy just on it's own.
I've seen some GDoc attempts at accounting for PTS expenditures, but what really is to prevent a "DAC" founder from pulling an Enron or running with the AGS funding?
There is nothing preventing it. However AGS has already raised most of the money it will raise via the BitShares X snapshot on the 28/02/14. So if they wanted to run away with the money they would have done it then imo.
Instead they have spent the money on hiring a great team and working extremely long days.
I'm not very technical, but I think it would have been possible to make XT tradeable earlier, They could have pumped it, spent $100k generating a lot of hype and then sold their shares without delivering anything.
The fact that they've not done that and spent a lot of time and effort developing whole new blockchain systems like DPOS too, makes me certain their intentions are not to make a few million and run away.
Threads like this, also convince me, the founders have much bigger visions and ideals.
https://bitsharestalk.org/index.php?topic=2853.15