try doing a search, matey. you cant just sit and wait for one to fall onto your lap... evidently you are not the only person after an A5, but also evidently, those other people are more keen to buy on than yourself, as they are replying to the selling post...
Most people, when selling, will post up what they have to sell, THEN while they are browsing the other classie's, and they see someone wanting something, they'll reply with a 'have a look here' type post, showing other people their thread. and be patient, theres no point flaming up at the end of everyon's 'iv just sold an A5' blaming them for not selling it to you first.....