Talk to your lawyer -- and build your own software testing and distribution infrastructure, and hire full-time testers because you don't know when the next kernel, or a distribution's kernel, is going to break your driver, and basically do the whole driver as a full-blown independent proprietary software product -- only it's a "product" that will make you no money.
Oh, and just in case the interfaces you're depending on ever change, better keep that lawyer on retainer.
About 20% of people who use Linux in business don't consider the driver license when buying hardware.
About 20% will not use a proprietary driver on Linux, period.
About 60% take the license of the driver into account in some way -- won't buy hardware if there's competing hardware with a GPL driver, won't use a proprietary driver unless their distribution commits to supporting it, or just use licensing as one of several factors when considering hardware.
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