You have many things in your list to discuss....first "Hi, I don't know you, can you do this for me - topic ! "....now this...

BaBa, don't make a fool of yourself here...its as simple as it is....in your first topic - its simple and upto you to pay your friend who recently became your very close friend....

Secondly, the tipping thing- its simple- if you want, you tip them as per your wish- if not, its upto you - they not gonna harm you for not tipping them....:(

Cheers !