I think that "low" is a relative term....if a generally well thought of piece is being offered for 50-60% of its retail value...that offer price seems reasonable and a counter offer for 50% is probably lowball and won't be taken seriously.
If the piece is being offered for 80% of retail, and its not some unique piece like a Philharmonic BMR, then the asking price is unreasonable and offering 50% is probably not unreasonable.
Also, I think that it is sometimes how you say it....example: you are asking $2000, I'm offering $1000 take it or leave it.....vs... you are asking $2000, I'd really like to buy it, the best I can offer is $1000 which I know is low...if for some reason no one buys it and you can get closer to $1000, I'd appreciate a message. They same the same thing but the level of respect is different.
If the piece is being offered for 80% of retail, and its not some unique piece like a Philharmonic BMR, then the asking price is unreasonable and offering 50% is probably not unreasonable.
Also, I think that it is sometimes how you say it....example: you are asking $2000, I'm offering $1000 take it or leave it.....vs... you are asking $2000, I'd really like to buy it, the best I can offer is $1000 which I know is low...if for some reason no one buys it and you can get closer to $1000, I'd appreciate a message. They same the same thing but the level of respect is different.