promethean

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Reducing this analogy, you obtain the simplest form of "C is like a Hammer". I really want that hammer. With it I could as easily manipulate the molecules in the wood I'm hammering as I could secure the roof to the frame of a house.

Buffer overflows would be a problem of course, at least for large buildings with lots of traffic-- after the 4,294,967,296th person the whole thing would just collapse.

That analogy only holds if you can build any object of a carpenter's skill with just a hammer, or just a screw driver, etc. C is a general purpose tool, compared to the task-oriented tools of carpentry.

There is a very strong difference in signal from someone telling me "I am an expert C programmer" compared to "I am an expert PHP programmer."

Leaving out the name of the programming language all together removes salient content without adding anything else of value. If I want to make your of your programming skills, I'll still need to ask "Okay, what languages?"

So, saying that "Calling oneself a C Programmer is like saying you're a Hammer Carpenter" is like saying when there is a choice between tool sets, the choice doesn't matter.

Be sure to consider the accounting & customer service costs of whatever model you choose. A one-time fee is is easy to administer, while a recurring cost is an order of magnitude more complex, and recurring costs with roll-over and top-up ability yet another order of magnitude more complex-- And not just from your side, but the mental burden it inflicts on the user. Recurring costs, no matter how small, always present a greater mental barrier to purchase than a one-time fee.