Module Development and charging

I’ve developed a EE2 module. It is currently in the beta testing stage between a few friends.

There isn’t a module available that does what my module does, hence why I developed it.

I hope to release it soon but my question is about charging users to download/purchase it.

How do you decide if it’s a chargeable or not?

I see lots of plugins/modules on devot:ee for example where developers are charging users to download stuff but IMHO should be free…

Free because they don’t do anything I can’t do that requires a plugin/module. But I guess not all EE users are programmers…

Interested to know what you think?

Sean