While I realize it is not looking promising for a Linux version of Affinity products at the moment, I do hope you will keep it in mind. I work for a Visual Effects company in Wellington, NZ. We have approximately 1300 artists and developers who use Linux as a primary pipeline environment. We spend a lot of money of licensing software, so I would strongly disagree with anyone who says that Linux is for hobbyists and that we wouldn't buy software.
Our software licensing includes a fair chunk of Adobe licensing. We also have a lot of users who would like access to a program like Photoshop, but their departments cannot justify the annual spend for Adobe licensing. We also keep a lot of older machines so that the artists who require Adobe software have machines to run Windows software on. This increases both our power consumption and maintenance / support costs.
We are one of a large marketplace of Visual Effects companies who must be in a similar position, all using Linux for their primary pipeline.
We do have a few users who are dyed in the wool Photoshop users, as that is their bread and butter and has been for years, but we also have a lot of users who regularly pick up new software and are generally very happy to experiment.
Please keep us in mind before you write off the idea of Linux versions of your software.