As a White western with the obvious means to travel, I feel like they (tours in just about every second and third world country) look at me as if I am an ATM machine and they just need to figure out the PIN that will cause the money to come out.

I don't take it personally. Just pressing forward mumbling "no thank you" seems to work okay.

At one ancient temple in India I did hire a young kid to drive all the other entrepreneurs away cuz it was so bad. I don't remember the insignificant amount I gave him but I'm pretty sure it was enough to feed himself and his family for a few days.