This thread has been very informative. Thank you to everyone who shared their input.
In the past I've not always kept good records of what I paid for chips, and been lazy when it came to creating wts ads and have therefore used the "make me an offer" approach at times. Mostly out of laziness and not knowing what to ask.
Those ads did not attract as much attention as other ads I had which had prices. And it makes total sense now that it could rub people the wrong way. Sorry about that.
So note to self, next time put way more effort into it and more research.