I'm personally concerned about a growing trend by some providers to accept donations up front for particular needs (they say) then never repay as promised either for bartered goods and/or services or cash. I know I'm not the first but maybe if these providers are outed in some way, perhaps in the men's lounge, the word would quickly spread. I'd like to hear from the community their take. I know it's an unseemly practice and one none of us should consider. But, if you have done this, or even thinking about doing it, you should know that it's not a business deal, though you might think it is.
Don't say you should never advance money. It's already been said.