An example of this is with a crappy lvl 1 -15 agent I got 10RP a day for Skill I and 60RP a day for Skill IV in Caldari starship Engineering. As LVL IV is only 3 ish days. It's worth while training any account doing R&D to LVL 4 in the science skill associated with the datacore research.
So spend an extra few days in training and get way more RP a day for free. It also makes those daily "Ferry this report 2 systems to the left" missions worth quite a bit more.