There are millions of sites on the internet for different purposes and people visit them or contribute to them or buy items from them or refer them for knowledge. Every site has its own way of working. Some thrive on membership while some thrive on advertisements. There is one very reputed and popular site which publishes quality articles but charges $5 per month from its members. Then out of that and some other earned revenue, it pays remuneration to the authors.
So, out of those million sites, there are only very few sites which pay some money to its contributing members and ISC is one of them. Now there are some guidelines for the payment and when it reaches a threshold, as initially mentioned by the member in his profile settings and payment settings or as decided by the site managers, the payment becomes due and is punctually paid by ISC. Sometimes occasionally, though rare, there may be a delay and in that case, one has to write a one-line message in the page where earlier one has submitted the invoice and it is immediately taken up and payment comes to the bank promptly.
Knowledge is power.