I think there are a lot of other variables as to whther you get a good price. Forget the obvious quality of the ad pictures etc. A lot comes down to how many people there are looking to buy one of whatever you’ve got to sell.
Really specialized stuff with a limited market either needs to go on for what you’ll take for it as if there is only going to be one person looking for it if you are lucky then a 99p start is all it will go for.
For everyday bike stuff the 99p start is always a great way to get interest, but is it the right kind? Its hard to say as I’ve sold stuff for much less than it should’ve gone for and vice versa.
Biggest surprise I’ve had was the ancient set of 18 year old Suntour Greaseport Pro Pedals with ti axles that I thought no one would want went for £48 and sold to a guy in Australia.
And then there is the things you are embarrassed about because uyou never thought they’d sell for that much even though you’d described them with all the warts scrapes damage described someone went and bid double what you thought they’d go for.