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What's the difference between ADT and Simplisafe in terms of cost?
ADT have lost a lot of market share to Verisure in the last few years in UK and in the US Simplisafe/Frontpoint have done something similar. You should be able to get a keen price by threatening to leave and if not there's plenty to choose from -
Like, just stop paying?
One reason to have an alarm system is for your insurance company which will require a maintenance contract.
When we moved into this house it had an ADT monitored system. We replaced it with an un-monitored one from someone else. The control box had to be replaced as ADT use custom firmware.
I've heard there a people who can remove ADT from the ADT alarm system. Jus' sayin'