A codester-specific License template

It is always difficult finding a good license agreement for plugins. The GNU General Public License is good but is only really for free plugins.
Would Codester be willing to put together a legal license template for developers to use on plugins they sell here?
Or even better, one that developers could use on this site and others (in which case I woulld be happy for the name "Codester" to be included when describing example sites within the license)

That's a good idea. GNU is indeed not ideal for selling on marketplaces.

Yes, that would be very useful! Something containing a disclaimer (limitation of liability) and so on.