"Lowball" offers on rental properties

[Matthew R Curcio]

If a place is priced at roughly market value, what is a good offer?  I'm looking at a place for 170k and wanted to offer 150K but my real estate agent claimed that would insult them and I need to stop with the "low ball" offers.  Closing coasts in NY are around 10 thousand so i'm looking at around 160K even if they accepted the offer.  Is she right?  In my way of thinking i'd rather make 10 low offers and be rejected on 9 so I can get the one that accepts at a good price.