Customize speaker selection

I really wish more companies...even mainstream Infinity, Polk, JBL,etc...would offer a stock budget model with the following simple options: a)tweeter upgrade(possible older model or from a line up to reduce R&D costs B)Crossover upgrade option: better caps, etc. C)Internal bracing options D)Single or bi-wire options...in other words... ala carte menu...I know some of the more established higher end companies offer Signature/Hotrod models...which is along the same premise...but this thinking has never "trickled down"...some much for Reaganomics!