There are clearly two very different views on this subject. The difference is that people who think "prices should always be listed" are wanting to force others to do business their way. On the other hand, no one has ever been forced or even pressured to "make an offer". I too like to see a price, but respect other peoples right to conduct there affairs as they see fit, so long as they are honest in doing so. Not that hard, if you don't want to make an offer.....
here it comes......
"Don't make an offer"