When I was a litle boy I learned from my parents not to ask for money for agni hotra jagna or a kind of service like that. So I don't like to ask for money when I do a fire sacrifice. I tell the people that a donation according to their capacity is enough but sometimes they gave me mor or less 4 dollars. I don´t like it but neither I don't feel good asking for a specific ammount of money but is a fact that fire sacrifice is not complete without the priest's donation.
So, ¿what is the best way to do it?