[george_sp]

Hey, first of all congrats. To be honest with you your description is vague and I expect not for no reason, so I'll also give a generic answer as I believe the "correct" answer (if there is one) lies within the specifics of your domain.

I see no problem in extending an already successful product with a set of new features. You can always keep your promise regarding one-time licencing, that does not mean you cannot create a business model on top of that that leverages addons for example.

Personally I feel that spinning up a standalone product involves more risk as a rule of thumb, but again, the answer lies within your domain.

If I had the choice I would probably leverage the "already achieved" success and since you believe that this feature will help your customers, I would give them the feature within my product suite. Also more revenue does not exclusively mean higher price. It might also mean *more* clients.

Hope any of this helps.