The only issue with tipping on this platform is the fact most come to make money, not give money. I've been going on about attracting the consumer type crowd for years, since they bring disposable income with them. And even then, voting is a far better deal to the consumer. That turns disposable income into an investment in entertainment or whatever, rather than a cost.
Voting comments is something I've always done. In a perfect world I wouldn't use my stake to vote other posts. I'd create content, entertain people, then shower them with gifts in the form of comment upvotes. It's really no different than offering someone a free coffee. Offering incentives creates competition. Others would have to hold their post earnings in order to take care of their consumers as well. It's such an intriguing business model but most of the potential goes over a lot of heads.