Gatsby does not actually offer Nick a job, but suggests that he could help him out financially through his vast network of business connections. Nick resents and declines this offer of assistance because he knows Gatsby is only offering to reward him for enabling him to meet with Daisy and for them to use Nick’s little cottage as a place for further meetings
Consuming more of your resources is a representation of status and bond. Having a large abundance of said resources causes your social status grows. Your friend circle starts to expand as you meet more people.