I think it would be useful and "marketable" if there were more clear upgrade paths, that also layed out how different similar plugins might be comparable.
Many plugins come with lite or "elements" versions, that indicate clearly, that they are the limited version of something bigger and then there's a clear upgrade path to the full version. And once you have the full version it's usually clear: you'll never need the lite version again.
Let's look at this with Melda's EQs
Do I ever need MEqualizer, when I own MAutoEqualizer?
Do I need those if I have MAutoDanymicEQ?
What about MEqualizerLP? MFreeformEQ
I think it would be nice if there was a "fully featured EQ" that can do everything
And then there might be a website showing all the EQs and what new features you can expect with the higher priced versions. Does that make sense?
This is not fully fleshed out, I know ... - would love to hear other people's experience and opinions on this
