We all have far too many properties listed.
Personally, I currently have more than I could sell in 5 years.
They still keep coming in, even though I continually try to get sellers to modify.
10% - 20% over is acceptable because the seller might take an offer or ask me to reduce after a few months (I do this willingly).
However 50% more is right over the top and just a waste of time listing it when you bear in mind that each one is 3 - 4 hours work (Making a valuation, discussing the price, taking photos, writing the description and unloadinmg it).
The problem of course is, that if you refuse to list at a rediculous price there will always be another agency prepared to take it on.
Then, 6 months later, the seller sees sense, reduces it to something reasonable, it sells and you have lost out.
Perhaps someone should be brave enough to list -
1. Current Valuation . . .
2. Offers Invited Around . . .
Homefinder