If the potential purchaser doesn't understand your ad, you are less likely to make a sale - so, I agree that shorthand isn't advisable.
As to your other comment - it is an open forum, so anyone can comment on another's "for sale thread". I've had people make unsolicited comments on my thread - the potential purchaser can make up their own mind as to whether they think they're genuine recommendations. People are fairly astute here (think of who is likely to be attracted to astronomy) and will usually see through a "set-up". I've also seen comments on some for sale threads that are pointing out "problems".
DT
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