Yes it sucks that most repeaters or private or require access. But its their time and money that went into putting the repeater up, so they ultimately make the rules. The mismatching of PL or DPL tones is done usually to slow down unauthorized users. If you ever visit NYC, you will see why its done that way. Some onwers only request permission, so this way they have an idea who is using it, and can keep track of how many users use the machine.