For what it's worth, I've been using my Kempers (rack and toaster) for years now and I have NEVER purchased a profile from anyone (M. Britt, Top Jimi, Choptones, etc.) and had it sound even close to what they have in their demos. I know there will be differences based on guitars used, speakers, fingers, etc. But nothing I buy is ever remotely close to how awesome things sound online.
I run direct into our PA and use Westone Pro 5-driver in-ears for live use. For recording I'm using SPIDIF out from a Focusrite Clarett 4 Pre into Reaper, played through a pair of Yamaha HS8 studio monitors with my Mac desktop. Guitar is a Guthrie Govan signature model Charvel, a Custom master-built Charvel, and a Fender American Telecaster Ultra. So it's not as if I'm playing on or through garbage equipment.
I've just resorted to finding profiles that are close to what I want and then just adjusting them to my liking. I'd love to be able to buy profiles and have them closer to what is advertised, but I'm still getting awesome results just tweaking profiles instead.