If everyone gives as they should, such people would not need to give any stipend and don't need to and no one expects them to, provided the priest makes a living wage. As for candles, since it was brought up, they cost hundreds of dollars per order. The Church loses money before it gains it back. I announced one Sunday that if people did not want to pay the prices for the candles that the parish council had set, they could bring their own. At first, the parish council was not happy with me. However, as it turned out, no one wanted to have to bring their own candles, and they found out quickly that the price+effort makes it worth it to just buy them from the church.
That all being said, some jurisdictions make sure that their priest makes a living wage, and others do not. This yields a huge imbalance, and makes a single standard as to stipends virtually impossible.