The problem with many ham repeaters around the country is that the available databases are not current. You will find many repeaters listed, but the tone required to open them up is missing or is wrong.
I frequently travel around the country and have found this to be my largest problem trying to use the ham repeaters in the region I am in. I will spend hours going through all the databases I can find and set my radios up for those channels. Then when I get there, many of those on the databases are not even there or have no activity, or can't be keyed up.
A prime case is there are some 10 repeaters listed for the region around Jackson, MS. Out of all of those, think there were only 3 that could be keyed and 2 had any activity on them.
How can you expect people traveling through to be able to use those local repeaters if the information about them is wrong?