If you assume that he will pay for 500 sales, I am sure that many authors would take that opportunity as you get a safe cash and when selling on your own, no profit is guaranteed.Am I right in this maths then:
Let’s assume $50 for the theme (helps my maths!), take 70% of that for exclusive author rate = $35.
So $35×500 sales = $17,500???
Sounds about right if you consider that they’re after full design & development. I mean, no-one would pay that without a guarantee on sales returns, but imagine if you were the lucky guy that commissioned Avada
Either way, this doesn’t have legs, I think it’s just someone looking to make a quick buck and not fully understanding the process of Themeforest, which is understandable to a degree I guess