Ending Auctions on Thursday and Sunday Night ... Why?

I've been tracking ebay auctions for cards for several years now and I'm fairly confident in saying that an inordinate number of auctions are ended on Thursday and Sunday night. Any theories out there as to why? Sunday I can possibly understand as most people are home after a weekend and (presumably) getting ready for work the next morning. But Thursday? What, do we spend Thursday night surfing ebay knowing that tomorrow is Friday and well, I really don't know. Any theories?
/s/ JackWESQ
/s/ JackWESQ

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Trevor