Budman...glad you had the opportunity to get that thought onto the forum for consideration.
Two issues here...begging on the street AND haggling over prices. The first issue is what it is and many have addressed. I have nothing else to add.
However, the second issue is simply the free market at work. Providers need to know that guys want to get the best price possible and we know they want to earn the most money possible for their time. Best example on the board is the ISO thread...seen guys that say "Have XX dollars to spend, looking for _<fill in the service>__".
It is up to the provider to PM or reply in some manner if that is acceptable. If his request is unreasonable, he won't get what he wants. If someone replies and takes his offer, that is up to her. You shouldn't care...none of your business.
My only other thought on your topic is that dickering should be done in private via PM, email, whatever...as it is between them and no one else. If he does a review the rate would be posted anyway so we would find out.