amazingly enough i have had the same experience, all day long i walk all over my neighborhood where there are a few regular beggars but i noticed one day one particular old guy in a wheel chair spent the afternoon on the plaza later that day a walked over to the market and spotted him with a king can of beer and his buddies all smiles, so i walked over and said hi with a big smile enjoy ! it helps a lot not to feel bad for these guys sometimes :)