LotusWolf305
The amount of revenue brought by the ads is not nearly enough to pay down the costs of maintaining the site, paying the wages of the official employes nor the fair share for the authors.
I'm not giving exact numbers, CKTalon did it multiple times, but one add amounted to like 0.3ss of worth.
Reignnessmei
No, the past system of free ss was too generous and was changed to the current one. But we don't know what future might bring so just stay tuned and watch for the news from webnovel. We, the authors, are just as clueless about the future as everyone else.
They reward points that can be later on exchanged for various things at the store. This question was answered by Yueyi in a separate, big thread about complains. If you have any questions, I would recomend heading there.
Jeshmin
Bonus coins do expire 30 days after acquiring them, the ones you get from pucharse do so in 90 days I recall, but head to Yueyi posts for confirmation. Coins directly bought with money never expire. I guess the coints that expired were the bonus one you obtained about a month ago.
Lower price for the coins as long as you log in daily to get the daily rewards.