My attitude is that if somebody is looking to buy an item, be it a motorcycle, car, caravan etc, that they will look at all available sales sources, Gumtree, Ebay, Bike Sales etc.
I recently sold a caravan which was advertised on Caravan and Camping Sales and Gumtree, eventually It was sold from Gumtree. I'm not sure at the end of the day if the $90.00 I paid for the add on Caravan and Camping sales was justified, although I did get a reasonable amount of response from the add.
As for my Honda ST1300, that has been For Sale now for many months, it is only listed on this forum and Gumtree. In the time that it has been For Sale I had one offer which was well below my minimum price and one phone call last week about it .
The guy that made the offer by email hadn't even looked at the bike, while I believe the offer was genuine it was obviously from somebody who was just bargain hunting. I guess if you make ridiculously low offers for an item often enough, eventually you may find somebody desperate enough to accept.
As for the phone call last week, the guy said he would try and get down in the next week or so to look at the bike. I'm not holding my breath waiting for him to show up.
My opinion is that the market is very difficult at the moment, nothing seems to be selling. People just don't have the money or they are reluctant to spend it or borrow it.