GD is set up to not be simply something along the lines of, “What is your opinion on tipping at restaurants?” That is what IMHO is for. Rather, a GD thread should have a specific premise to debate (and opinions should be on topic). For instance, GD might say, “Working for tips leads to situations where people are underpaid when people don’t tip, and if you make tipping mandatory you might as well increase a worker’s salary and charge customers more for meals and eliminate the tips.” Then people can argue back and forth in support or opposition to the premise, whether that is through cited studies, personal opinions, anecdotes, cited articles, statistics on restaurant revenue, etc.