The catalyst does not deliver
Loss- Day beforeA stock trades at $495 ahead of earnings. A trader buys $510 calls expiring the next day for $1.50 ($150 per contract).
- Next openThe stock opens below $510.
- CloseThe calls lose nearly all their value.
Result: lossLoss of up to the full $150 premium per contract: 100% of the premium. This is why total loss must be affordable before you enter.