In the last 20+ years at this (50 years in total) I've been teased into trying various tweaks including fuses, footers, special electrical grounding devices, various cables, and even battery power (a step beyond power conditioners/inverters). None provided any noticeable sonic improvement, except ridiculously thin versus thicker speaker cables. Note that none of these were expensive, except for the battery power. Most tweaks (or various wires for that matter) don't have a true scientific basis behind them, that should tell you something. I don't have golden ears, but still have a brain.
Audiophiles always strive for better sound. They're prone to try home brewed stuff, thinking they know better than the companies that have long histories, deep R&D resources, and don't have to rely on big marketing budgets. The little firms are typically just one step above DIYer's, especially in this age of the internet. Audiophiles are also suckers for big, fancy, bold, and glamorous gear. C&C machines and exotic veneers are popular among loudspeaker aficionados but don't make them sound one bit better. Just examples of what marketing does for audio.
