I can only assume that the hardest part about keeping any repeater directory current is the fact that so many clubs and individuals go through the process of putting one up, and within a year or two they either break down and don't get fixed, or they are taken off line due to inactivity.
There's a guy in the next County from me that had a 70 cm analog repeater up and running, when I got the ID-800H for the OEM I tried to program his repeater into that radio with no luck. I finally called the guy to ask if he took it off line, and he informed me that it was changed from analog to digital. He had it up as a digital repeater for about 3 months, then one day it again would not come up, I call him and was now informed that the digital equipment he was using was borrowed, and had to be returned, and that his repeater was now back to analog......
This is just one isolated scenario of what happens all around the country with 2 meter and 70 cm repeaters. One of the clubs I belong to had a 220 repeater up for approx 15 years, it's been off line for approx the last 8 to 10 years, yet it still shows up on a couple internet repeater lists, as does several other 2 meter, 220, and 70 cm repeaters that haven't been in operation for many years.
The main problem is, those who erect these machines jump through all the hoops to get them licensed, and approved frequency pairs assigned, but when they take them out of service they do not inform any of the regulatory agencies that the system is no longer in use, so they continue to be listed as active.
I a word......Frustrating.....