Something nets out - meaning has/results in a summary value, including various side-effects - for whatever form of value you're assigning.
Something nets out the same if the outcome is of the same value. It can also net out better or worse.
Your example is from a humorous source, so it's used tongue-in-cheek: "I worked every night for a month" yielding the same result as just coming up with the figure with minimum effort.
Let's take some more standard examples:
"Why are you shopping at the corner store instead of going to Wal-Mart? The prices are much lower!"
"If you count the cost of fuel and the time wasted getting there, the corner store nets out better."
If we wait for the bus now, we'll net out about the same time-wise as just walking there on foot, and that's assuming the bus won't be delayed.
And something counter-intuitive:
The device, the user manuals, cables, inner packaging, outer packaging, pallet and securing straps will net out over thirty kilograms, and that pushes us into 'cargo package' territory.
The expression to net out comes directly from net weight:
Actual, computed, or estimated weight of a good without its container and/or packaging. Gross weight less tare weight equals net weight.
...which in this case means something exactly opposite!