I guess, if you're not comfortable using unsupported unofficial software that's in beta stage, you shouldn't be using Scrivener for Linux. Still, the worst case scenario as far as I can tell, is that you buy a Windows license and run it under WINE?
Actually I own two Scrivener licenses (Mac & Windows) The Mac license runs on Apple abandonware; and L&L no longer posts bug fixes or updates for that version. As for the Windows version, Microsoft is forcing a mass migration of their user base into a moonscape where many are loathe to go. 'Nuff said.
I've run the Windows version under Wine on several iterations of Debian linux (Ubuntu, CrunchBang, SolydXK, Mint, etc) and in reality, Wine sort of, kind of, mostly
does work, but is not really (at least in my experience) a satisfactory substitute.
In short, the Linux beta runs far cleaner, faster, more typographically sharper, and better on Linux; and the Windows version runs totally clean and fast on Windows ... as intended.
Wine is still a work in progress, mostly focused on game enthusiasts (with an exception made for MS Office essentials) and is not a panacea for Linux users needing a substitute platform for Windows apps. Others may disagree, and your experience may vary. Just my $.02 worth.