This has been suggested for years but has always been ignored.
Players that cannot disable traps and are not fast enough to group with elites often get frustrated and leave DDO for other products. It seems that many newcomers are leaving somewhere around level 10 of their first play through even thought there are many quests still available.
Having Rogue trappers available to hire for platinum should cause a few to stick around long enough to buy an expansion or two.
Don't expect any frustrated player to pay real world money for Rogues that everyone already knows should have always been available for platinum.