Prices on birdtrek

As it was mentioned by @Dom .........

I can make filling a box out compulsory for a price but if someone has a list of birds it doesn't work. Also it is not applicable to wanted adverts. It further complicates placing adverts. I try to make it as simple and quick as possible whilst keeping out the scammers.

I could really do with writing a guide on the 'perfect advert'.  Any input appreciated.