Amateur Hour?
With that pay rate, it is highly unlikely you would get any competent person to stay long enough to be familiar with the code base, which takes a few years realistically. Thus, the code is either written by incompetents or amateurs. While the amateurs are probably moderately competent, they are lack experience and do not deal with code on a routine basis. The incompetents, the less said the better. The net effect is the poor code that probably has serious issues.