Ignored Offers


I have been buying and selling equipment on this site for many years. I have noticed recently that sellers are ignoring my offers. In one case my offer was more than the item eventually sold for, so clearly it was not a low ball offer. The other item I bid an amount based on prior Audiogon sales. Any one else notice this trend?
proacman
Over a year ago I made a very reasonable offer on a Mc amp and never got a response. The amp is still for sale. I would be nice to at least get a "no thanks" or a counteroffer. 
I asked a question about some speaker wire for sale (4 days ago?) and the seller hasn't answered. Lost sale..
I just had that happen to me on epay.  I made an offer,at least expecting a counter offer,nope,just crickets. The item was listed with buy it now,and make offer. I also don’t feel that my offer was insulting. The real funny thing was earlier that day, I sent the seller a question,and he responded in about an hour.