Value of QuantityBreak and QuantityBreakType entities?

[Christian Carlow]

Can someone explain the value of the QuantityBreak and QuantityBreakType 
entities?  Is the QuantityBreakType entity necessary?  Why wouldn't the 
same quantity range be used regardless of the break types?  Also, I 
noticed that the "Shipping Estimates" tab on the Catalog->Store app 
doesn't even reuse existing quantityBreaks with the same range and 
type.  Isn't the point of having the QuanitityBreak entity to reuse the 
ids existing ranges? I'm trying to implement quantity ranges for 
QuoteItems and the QuantityBreak entities are introducing more 
complexity than seems necessary.  I think I remember someone mentioning 
on JIRA that QuantityBreaks were something that should possibly be 
cleaned up.