Not all spells require money to do, people use ingredients and other things to use because it helps give a spell an extra boost. Spells you want should be casted for you. Here is example of what I mean;
Lets say you want a love spell done, so you ask your friend or someone to do it for you, for one how are they suppose to know you feeling for that person unless they are "in love" with that person too?
So the odds are of a spell working from someone elses intent is very slim to not happening.