It takes what it takes.

It really is very simple and when you read or watch examples, where you apply the cost cutting principle of VFX to other business, you just have to laugh. Yet people don't really get it or just choose to ignore it.

Great read by Scott Squires: Visual Effects are inexpensive.

And this is just too funny:

Failing VFX business model and tips for students

This business is scary at the moment, with companies laying off a big chunk of their workforce, streamlining staff or even closing altogether. Uncertain times, while tent pole movies are totally VFX driven and most of them very successful financially.

There's an interesting post called Why is the VFX business failing at its moment of greatest success? that's worth a read.

And 9 things they never taught you at VFX school is a very good post as well.

Go check them out!

Added:

A very detailed outline of visual effects business practices by Scott Squires.