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Lots of people trust closed source applications though. QuickBooks, Turbotax ..
Your point is still valid, though I don't know what the exact differences between Iron Money and (say QuickBooks) are.
No, they don't trust them, they use them because they have no choice. And the problems caused by Intuit's closed-source business model are legion:
http://www.consumeraffairs.com/computers/intuit_turbotax.htm...
The above sounds like a recitation of distrust, not trust.
