At the moment I am working two jobs - one doing accounts/admin and the other is working as a bathroom attendant at a nightclub; it's not what I want to be doing, but its extra cash. I have a range of products people can "buy". I don't demand money, I do not hound people for money, and if people give me a "tip" it's simply by generosity on their part. I won't bore you with the details of the incredibly rude, ignorant, horrible cows I have to deal with. Nor, will I tell you all the stories and sights that have left me quite mentally scarred lol!
As for cheap; I have numerous people who will come in, use every bit of product I have, and either give me nothing, or else give me a a handful of coppers (1, 2, & 5 cent coins). I'm sorry... I don't want an handful of 1 cent coins anymore than the next person.. infact I would rather somebody give me nothing than a handful of coppers. I also get the IOU's "I'm sorry, I've used such and such, I have no money on me but I will bring it into you next time!". Yup, would you go into a shop, buy a can of coke and tell the person behind the till that?!
Stop for a minute, open your mind, learn. You may not agree with what I say, I may not agree with what you say but we will both learn something new.