Okay so people who offer services for money and charge other people how would someone know if you were legit or not ? They just put their trust in you and believe that it's gonna work? Also do you work with spirits to help assist you. Most people can probably do it for themselves and also okay say a spell that is for money what if someone said they would pay you went they got the money to know it was real or what not? Would you do that or? Just curious. Just feel if you do spell work and was confident in your work you would be okay with it. Can someone ask to be rich or is it just for a couple 100 dollars ?
The vodous don't work for free or I wouldn't charge. The vodous require offerings and more often sacrifice and neither are costs anyone should expect an adept to absorb.
As for the validity and efficacy question it depends on your tradition. My name carries weight on three continents, but it is the people of Motolikope and the members of my lineage that validate my medicine. Locally, I have helped businesses thrive and people deal with... troubles. This is another good reason why community is important. The people knows who to go to for help and who to avoid.
Vodous enhance medicine. More importantly, they see what you cannot and protect you from the unforeseeable while you work. Witches and sorcerers are supremely confident of their abilities. To wield the forces that so many do, they need to be. But it also makes them certain they've covered all of their bases. The priest knows his limitations, so we enter the simplest of situations with a veritable army of spirits, ancestors, and divinities.
Finally, I do no work without payment up front. I've tried to work on speck before and the result was being cheated by someone who later came back to beg me to take my spirits off of them. For the record, I've never asked my vodous or ancestors to avenge, revenge or assault for me. The vodous, my vodous, are spirits of morality and justice (among other things) and would injure me if I was to send them against someone unjustly so I just don't. I leave matters of justice for me to them. Anyway, you make them pay up front to avoid causing problems for yourself and the people you're trying to help.
---Money, Medicine, and Magic---
Many people in our sphere consider money to be a bad thing. It isn't. Money, cash, is an oath. A promise. It's literally in the name. Promissory note. There are spirits that are a corruption of this social arrangement; the exchange of an oath for something of value. They are Greed, Tyranny, and Lust for Power. But there are spirits who are the honor of these social contracts. They sanctify the exchanges of oaths for goods and services. We do not reveal these spirits, these vodous, because sorcerers and witches would try to bind them like they do everything else. I'd rather not have to start "liberating" spirits. That gets messy.
Mutual need unites us, humans I mean. And the spirits of money exemplify that interdependence. So don't shy away from paying for medicine, craft, and work. There is tremendous good in it.