For LIGO, mergers are just the beginning. LIGO isn't just a merger detector, but an entirely new window of astronomy. There's also teams looking for stochastic

For LIGO, mergers are just the beginning. LIGO isn't just a merger detector, but an entirely new window of astronomy. There's also teams looking for stochastic background signals from the big bang (similar to the CMB), or a constant hum from spinning neutron stars. And not to mention, if the sensitivity continues to improve, the moment of merging from BH-BH collisions could lead to new breakthroughs in GR.