GW2 has a good direction when it comes to instanced dungeons which i really like.

You get 20 tokens when you finished a dungeon, but you get extra 40 tokens if that is the first one you do today. So you get 60 DH tokens if you cleared it today, but only get 20 if you re-cleared it. However, if you go CC, it will counts as the first time you clear it today, so you will get 60 CC tokens.

Hardcores can still spam the dungeons to get equips asap as there is no reentry timer but they only get (40)20+20+20 until the next day, the casuals will just do one type of dungeon every other day, one day they will do a CC, AV, DH only and get 60 tokens of each dungeons and do the same the next day, this way they can catch up easier but hardcores will still have the privelege to be the players wearing the equips the first time, while the casuals may have to wait for weeks to complete a set if they are only doing one of each dungeon everyday.