I concur with all the previous answers.

I have found that people relocating from other parts of the country will often make low-ball offers on homes that are already priced very competitively, and the sellers react emotionally; the sellers have a negative opinion of dealing with the people who made the low-ball offer, and they do not pursue "getting the deal done", but rather seek out other buyers.

Good agents of course will try to mitigate this reaction.

If the property was priced right to begin with, it would probably be considered too low by the seller. The seller then has the option to reject, accept or most likely they will counter the offer. There are still some homes in the area that are trying to get the "post Katrina" prices, but the only way to know would be to have an agent run the comparables for the neighborhood. Call me at 985-641-9563.

80% of what relative to whom?
Need more specifics....if you had the right agent working for you, one would know the answer.
Get the actual SOLDS for the comparative house you are looking at buying...and know how long these houses took to sell.

That all depends on whether or not the property was priced right to begin with. If the property is priced competitively 80% of asking price would be pretty low, but if it is priced significantly above the true market price, it could be just right.
If you would like a current analysis of similar properties, contact me at (985)807-3159.