Even though Dustin was enthusiastic about going to the bright part, he also wanted to use the night crawlers to grow stronger. The opportunity he had with the night crawlers was like one in a time kind of thing, he just couldn't abandon it.
'I should really think things through before I talk. The more shit I say when I'm alone, the more it slips into my normal speech around others.' Dustin said in his mind.
Seeing as Dustin was a pretty careful and cautious guy, he made way too many flops when he was alone or at home. If someone was to catch him making these blunders, they would never expect it.