Given the big picture and the laws of diminishing return most of what we do here falls within the purview of silly. I wasn't satisfied with the HD800 and the Zana, and neither was I satisfied with the Beta. Together they play well and cover most of the bases. Same case applied to the LCD. The Decware amps, Taboo and CSP2+, when together, provide enough of an improvement for me to justify the expenditure and shelf space. If it's silly, it's in the way that any purchase intended to improve upon a current sound is silly.
As for shelf space I've already built upwards of 7 feet vertical. Unless I plan on enshrining these amps with a 12 foot structure, a couple of them, the "redundants", should probably be sold.