Three weeks ago I put my boat up for sale on Apollo and sold it within 48 hours for the asking price. In a tough market this wasn't luck. I thought about a broker but I gave it a shot on my own. I spent considerable time marketing the boat much like a house, considering the right price, took plenty of quality photos and plenty of relevant information in the write up. After 4 calls and one vieweing (the first) I'd taken a deposit.
I have to agree with your thoughts on Apollo, so many people take poor photos and haven't even tidied up! We're talking about thousands of pounds. Tens of thousands. Make sure your boat is spotless inside and out when viewing and complete all the niggly jobs, however small. A buyer needs confidence in you and your boat...