Closed source and DRMs are old models, mostly created and maintained by the entertainment industry (for poor results).
They went wrong because once the product became data, then it became a commodity whose price naturally wanted to collapse to the marginal cost of production (for data, very very low).
There will always be a market for entertainers to produce live performances and bespoke works, and that market doesn't require DRM because the product is
intrinsically uncopyable.
Likewise, source code is just data. You can't really sell source code. You have to find something else, something intrinsically uncopyable, and sell that instead.
And that something else is expertise. The "know-how", the (long-term) experience, that you can sell to those (generally businesses) that need bitcoin & wallet-related consulting services.
If I'd be a company needing to handle, deal with, store, secure & distribute bitcoins (e.g. a large or even a mid-size company accepting bitcoins), I would be happy to by for such services. Actually, I would _need_ those services.
Handling money or anything of value costs something, that's just a fact. Saving tens of thousands in credit card & banking fees, I would surely spend some of that on consulting & security services to be sure that I have good systems that use and store bitcoins.
Being a developer of Armory, or being the company behind it is, I think, an incredible visit card for proposing such services.