In this case, as usual, the amount of hours "spent" on the project has little to do with actual value provided.
From the contractor's side, he's excited about getting 12x the original quote, instead of realizing he's been severely undercharging for his work and could've been earning 10x or more all this time. I wonder if the author will start charging appropriately for the value he's providing, or if he'll consider this a fluke and continue with $75/hour.
Phrased another way... How many times did you complete a project within the estimated time and get paid $1,500, when actually the company would have been glad to pay $18,000?
Last week there was a thread about consulting tips. I couldn't believe how many people were arguing for hourly billing. One person was even proud of billing by the minute! I hope those people see this story and realize what they're leaving on the table.
I have similar stories to this, where work got delayed due to issues on client's end. One time, I spent a month doing nothing while the client was dealing with something, which later turned out to be a big acquisition. If I billed by "hours worked" then I'd get nothing, but because I had a monthly retainer I still got paid.
Edit: I'm not advocating "fixed price." I'm advocating monthly retainers.