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I am unable to notice the reason behind this.
However even if the algorithm drops 5 to 10% of the description, think about the savings in bandwidth..
just 1 byte. 1 byte * 10 listings ( default ) * 100,000,000 searches a day. That's 1 billion bytes less a day that they need to transfer.
it allows for more searches, without needing to buy more equipment.
I also noticed this trend when they redesigned the serps last year...
That's 1 billion bytes less a day that they need to transfer.
1 Gig of trasfer costs about as much as they earn from 2-3 clicks, in fact for bulk buyers like themselves 0.5 of click should do. I don't think G-men even think in terms of giga- these days.