I've learned to be discreet about advertising any particular success I've had busking. The surest way to lose a good spot is to let it slip that you made a lot of money there, tempting as it may be to boast or share your joy. Sure as [insert appropriate image], next time you show up to busk there, you will find someone already ensconced in 'your' spot. And it may be someone who never busked before, but when they heard how much money you made, decided to give it a go - in the spot that you were so pleased with.

I never tell anyone how much I make or don't make busking. If you tell them you make a small amount, they look at you with contempt; if you tell them you make what might seem a worthwhile amount, they or one of acquaintances starts competing with you - and any given city is only going to support so many buskers.