Speaking personally, I don't feel qualified to tell SD its business, and I don't think that's been the gist of the comments here. These are customers who, like I would were I on Win10, miss a great product and are letting SD know, in their own way, that there is still at least some demand (in the economic sense) for it out there.
It's obvious to even casual observers that SD's main business is now firmly in the gaming arena and I wish them much success there. I'm grateful they've hung in with supporting GUI customization & OS enhancements to the extent they have. Considering the Apple-like trajectory MS is on, however, with their moves toward controlling every aspect of your computing experience, I can easily envision a not-distant future where customizing the OS will first require the equivalent of a 'jailbreak'. This would have the obvious impact on SD revenue from the WinCustomize side of the business - if/when it drifts too far south of profitability, it will disappear. For all I know, it's already under water and being effectively subsidized by the gaming side. But it's been a good run and props to SD for putting out some great stuff that I've thoroughly enjoyed for nearly 15 years.
Nothing lasts forever, folks.