How well should we know our commission plan?

I never really cross-check the amount details I mean sure I check my QCommision reports to see if each deal is mapped but I barely cross confirm the accelerators or markups in place. 

We get a long long documentation to read half of which is alienated language. No one really seems to care but it's been ticking me off lately. 

Is this a common practice? Or is everyone made completed aware of all variable components in their variable pay?