Sounds like a good ROI...

Via ABC 7: 

Police in San Francisco took in 187 weapons during a gun buy-back Saturday morning.

The four-hour event, hosted by United Playaz, yielded 57 pistols, 44 revolvers, 11 assault weapons and three shotguns. One of those shotguns was homemade.

United Playaz is a violence prevention and youth development organization located on Howard Street in San Francisco's South of Market district.

The event offered $100 for every handgun and $200 for every assault weapon, no questions asked.

Read more here.