Well, the real reason it was shunned was because it was made before the class even came out to global, and the op was just trying to whore out for a sticky.
Through the 30s, I'd say around 35, you can go to nightmares in the haunted mansion. Just about 2k hp(1930 to be exact), for 120 exp.
By 40, truckers are a great place to go. These would be in Singapore. 3k hp for 160 exp, a good step-up from nightmares once you can handle it. As a forewarning, truckers can hit up to 500 damage, on the average mapler, I'd say around 400 with defense.