Really, Marave is maybe a month of part-time programming. How could that possible be U$S71355, or "1 Person Years"?
Is this garbage the best we have to estimate costs? If that's the case, then whenever you see something about "Open source program X would take Y years and cost Z dollars to write", cut it down by a factor of 10 or more.
Here's what Marave really costed to develop:
Ok, here's what it would have costed if I had charged for it:
I am guessing about 100 hours of my time. At my "I hope they pay me this much" rate of U$S 40/hour , that's U$S 4000, which means Ohloh is off by 1600%.
OTOH, for that much freelance work I would not charge you the full rate, I would probably end charging you more like U$S20/hour which would make Ohloh's guess over 3000% too high.
In conclusion: if you like my code (and hey, you can see it for yourself), hire me, I am incredibly cheap, or amazingly fast!