Yes, let's introduce commerce and spam to a system in which people already expend a lot of effort against spammers seeking fake internet points. Please, no. L

Yes, let's introduce commerce and spam to a system in which people already expend a lot of effort against spammers seeking fake internet points. Please, no. Let's stick with a site that is mostly populated by people internally motivated to provide good answers, rather than a site that is mostly populated by people externally motivated by money. The answers will, on average, be poorer, guaranteed.