Simplified version : payout for ads only is never.
I've got like $45 on my account after 4 years which, to be clear, by tapas standards is nothing to complain about, it's a lot. 18 cents of that is ads. The rest is individual people being awesome.
Also note: getting adrev at all is good. Adrev on anything that isn't video is always going to look bad numbers wise when compared to video adrev, because video spots cost more to buy and can be shown more frequently to the average user. Getting a few cents for 300-ish impressions is not bad at all unfortunately. Added to that, tapas' bar for entry to be eligable for adrev sharing is extremely low which gives a lot of people false hope about making money. You only need 100 subs here, no requirements for monthly reads or likes. In contrast on youtube you need 1000 subs and (what's harder to get) 3000 hours of watchtime (yes, the time has gone up, it used to be 400 hours).