If it were up to him, he'd already be flaunting his title as one of the key disciples, making rounds at those wealthy families' homes, sipping tea, chatting away, easily pocketing countless tributes. The cultivation resources would pour in relentlessly, and buying a few sets of Holy clothes would be no problem at all. Why bother working hard on tasks then?
And to put it bluntly, if you don't fight for these opportunities yourself, someone else will snatch them away. Imagine Lu Qi securing his position as head of the Mechanical Railway Academy, then garnering the support of local Immortal Families, and fostering good relationships with local magnates, being seen as the heir of the key disciple. Where would that leave you, the senior brother who can't even name all your peers?