This feature seems new. Pretty straightforward and basic, but only applicable to people who make models. It looks like the totals are visible for everyone now on all but the newest models (My opinion: I'm mostly worried some IP holder is going to use this information as part of legal action).
For anyone wondering: Most of my LoRAs have not made back their training cost even remotely. Pictured is by far one of my most popular models, and for most the training cost is 500 blue. A few more have gotten over the line via posts to their gallery, but even then I estimate less than 1/10th have at all reached the threshold (and that's not even counting the several dozen buzz I often burn making initial galleries in the cost) and those that have took many months to get there. In-fact most haven't even earned 50 (1/10th the cost).