I'm unhappy to report that I was scammed again on eBay, by 3 different sellers in a row (I highly suspect it's one same person), all selling bike lights for attractive prices. Like the previous one, they had good feedback since last fall until very lately when almost every feedback is complaint about scam--no shipping or no reply. They have some 400+ feedback and 96%+ positive (could be 97~98% before the recent negatives). I suspect they already had the plan in mind when they started selling with a new account: sell for 10 months and get enough positive feedback, then finish with fraud.
I didn't expect to encounter so many scams within such a short period. Lesson: don't be fooled by too attractive prices.