Van Gogh was not poor. From 1882, he received financial support from his brother Theo, who had been appointed manager of the Parisian branch of the Goupil art dealership.
In the first few years, he received an average of 100 to 150 francs a month. At the time, that was about 50 or 75 guilders, in any case a lot more than the 32 guilders a factory worker received back then to support a family of seven.
There’s another reason why Vincent was often hard up. Painting supplies are expensive and he usually used up most of his money buying what he needed, leaving little left for food and drink.