JD,
You may have been down to 10 gph, but you were not using a block designed to work at that flow rate. As to flow resistance, bear in mind that pressure loss is a function of flow and the resulting pressure required to move 3 gph is virtually zero.
At 3 gph, convection coefficients obviously would be quite low. This is why you would require a block with a whole lotta surface area in contact with the water, ala a typical air cooled heat sink.
It will work, but it'll never be used by the hardcore DIY crowd, who incidently make up far less than 1% of computer users.
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