It's harder to find a loan to a league 2 club than a Blue Sq, especially from L1. L2 clubs despite some budgets being lower than conference teams see there squads as full time pro's, long term deals and Premiership loans. Being offered a Charlton youth player out of L1 to solve you're problems doesn't look the same to them, he would almost certainly spend more time on the bench than starting, hence knocking his development back. As for the conference teams, their squads are often smaller, players move on more often due to month to month P/T deals, so these loans are often cheap and easy for them, whilst seen as a big deal as they're getting a F/T player, when they may not be. That's why our players go to the Non League