how do we know what we're working on is worth it? In other words, how do we measure what we're doing? you charge someone (an advertiser or customer) for attach

how do we know what we're working on is worth it? In other words, how do we measure what we're doing? you charge someone (an advertiser or customer) for attaching their name to or using your product/service and they agree???? we even have units to measure this, we call them dollars!!