Saw this and had to share (I believe the relative theory is transferable to Bass guitars also):
 
 
 

Kool !  
 
Here is Mr. Einstein playing for real !  

The theoretical explanation for the answer to the question how many guitars / basses is too many?
 
Answer: just one more.

From the WWE, that was Christian's cry; Just one more match.  Tell a spouse that, they never seem to buy it figuratively or in actuality.