So the difference is that Jarrod earned $2,000 more--or roughly 25%.
On the other hand, Sascha(who made less revenue) had 1,234 or almost 5 times more paying customers than Jarrod.
You could argue(without seeming crazy) that it is better to have about 1,000 more paying customers for something like an ebook, even it means losing $2,000. If Sascha's product was something like a SaaS product and each customer had a support cost, the argument for fewer customers would be more reasonable. But for something like an ebook, I'd chase volume even at the expense of a couple grand in revenue.
It'd be interesting to track this in the longer term if the authors launch more products. I'd put my money on Sascha to make more $ from future products and come out ahead of Jarrod at the end.