Silsilah as-Sahihah 1137 — Why is a trader sinful?

It is narrated from Sayyiduna Rifa’ah bin Rafi’ (may Allah be pleased with him), he says: I went out with the Messenger of Allah (peace and blessings of Allah be upon him) towards the Eid ground. The Messenger of Allah (peace and blessings of Allah be upon him) saw people buying and selling and said: “O assembly of traders!” They responded to the call of the Messenger of Allah (peace and blessings of Allah be upon him) by raising their necks and gazes towards him. Then he (peace and blessings of Allah be upon him) said: “Indeed, on the Day of Resurrection, traders will be raised as sinners, except for the one who fears Allah, does good deeds, and speaks the truth.”