I have gotten a Scroll of Bind, Scroll of Blind and Scroll of Paralyze from them several times.
This spot you speak there are several actually. some have crawlers+yagudo the other have Gobs + Crawlers. very good places for quick killing/cash if you are strong enoguh to not worry about possible link/agro. Look for small fires at night usually has several mobs gathered around there.
There are several "campfire" areas. one is around the top of G-9(not actuall fire but generally has large group of yagudo and crawlers nearby), another is at H-7 and upper portion of I-6
man found a spot were there is a camp of the bird duds...crawers....man i made 4k in like 5 min!!!!! dont think its a bug but its a nice pop spot that and the spells it was good to be a red mage that day..lev 11 in 3 days and still geting ex if you see a camp fire near a tower and see me stop and say hi....