Lloyd was smart enough to know they had to get out of that town and live some sort of life. Harry wanted to continue building up their worm farm business.
Harry knew how to read Lloyd knew how to scam.
The last scene shows they're equally dumb. Harry could've been like hell yeah we're your guys if he was any smarter than lloyd.
the original ending was supposed to have them actually get into the bus with the ladies but Jim Carrey said that he didn't believe the characters were smart enough to actually get into the bus with them