Posted: 29/07/2014 at 08:21
Leaves aren't right for blackberries.
As has been said, a rubus of some sort, not one cultivated for culinary use so unlikely to be very tasty but not poisonous.
Re foraging - it takes a lot of knowledge and experience to be able to teach other people about foraging - what's safe to eat and what's not. $50 = £30 approx - that seems to me to be reasonable payment for someone's time and expertise.
Don't eat things that you don't absolutely know are safe to eat - I could show you fruits, leaves and fungi that are safe to eat, and eat them in front of you - and then show you some that you thought looked the same, but they would actually be harmful if you ate them.