I tend to avoid Advanced because I honestly don't have time for that length of post every day, but when I've read other RPs in Advanced out of curiosity I've noticed that the quality isn't often actually any higher than 'High Casual' RPs I've been in, if not lower. So perhaps it's the higher proportion of original RPs versus fandom RPs that separates it from many better-quality Casual RPs... it'll be interesting to see how the different 'levels' establish themselves now they've been rebooted in 'Newguild'.