Wen Nan is certainly not Grandpa God of Wealth, and he isn't a wasteful spender of money either.
He simply believes that more friends mean more opportunities.
Judging from the task settings in this trial map, although the four players are not exactly cooperating, they are definitely not in a competitive adversarial relationship either.
They were destined to meet during this newbie trial, like classmates having studied together.
Therefore, for Wen Nan, lifting a hand to help them costs him nothing.
Someday in the future, if Wen Nan falls on hard times, and just so happens to encounter them, maybe they would lend him a hand because of his current generous deed?
Of course, that's just one aspect of it. The main thing is, Wen Nan isn't hurting for money; giving it away to make friends doesn't cost him much.
Wen Nan looked back and forth between Shao Ling and Huang Tao. Not only did he refrain from acting like a creditor, but he even asked with concern, "Is it enough?"