I suspect Yale will sell thousands of their shit alarms a week,
A proper house alarm can be had for roughly the monthly payment of Range Rover... oddly expensive cars parked outside houses with shit alarms is far from uncommon
My personal fav was rs4 & powermax comprising of 2 door contacts
You're right a blank keypad is not nessacarily going to be a faulty keypad. With no way of shutting the alarm up if you make a wrong move, I am not sure that I would be wanting to DIY that.