Spending way too much time on this after getting baited by the WN cover and getting fooled by the confusing preface.
His poor mom put him through a poor school full of somewhat better off brats whose only advantage over him is a decent diet and an allowance.
Old man: You can train yourself, but I won't supply you any books, a gym, or even human contact for a million years.
MC: That sounds very suspicious.
OM: Free Food
MC: Sold!!!