Thanks dude @promosapien for chiming in…as an author and buyer your voice is paramount and you have that experience of being in both camps which is very important in this discussion! Glad you see my point 
It just makes so much sense to have credits…if a customer is able to buy a 100 credits they can spend this across all market places when they like and not all at once, convenience that’s what matters here…for customers! This gives customers an incentive to return and top up.
The credit system should be one of those things that helps to make Envato Great!