I am a diocesan priest in the parish of Cyrill and Method in the Archdiocese of Vienna, and a teacher at the Do the saints tend to be healthier, wealthier, and wiser than the rest of mankind? Do holy farmers, e.g., overall enjoy better crops, healthier children, etc., than industrious and careful but less holy farmers? Most Catholics, I believe, would without too much hesitation say "no". We don't associate holiness with temporal or outward prosperity bestowed by God. And this is also the catholic tradition. ("Whether temporal goods fall under merit," Summa theologiae, I-II, q. 114, a.10)
And yet, when we consider praying for good crops, healthy children, health for ourselves, and the like, we tend to assume that those who pray for them are more likely to receive them than those who do not, or at least to think that if we pray for them, we are more likely to receive them than if we do not. But should we really expect God generally to reward these particular acts of piety with temporal goods to a greater degree or in a different manner than he rewards charity and holiness with temporal goods?
The problem is, I suspect, that we haven't radically assimilated a necessary condition of prayer, namely that we ask for temporal goods only inasmuch as they are conducive to salvation. (Summa Theologiae, II-II, q. 83, a. 6). We at any rate frequently do not consciously think of this qualification when we pray for good weather for an outing or event, or other such things. We don't exclude it, perhaps, so that we would desire good weather and ask for it even if we knew it would be less conducive to salvation than bad weather would be. But it's not so present in our minds.
But if those who are righteous, and therefore merit eternal life and what leads to eternal life, do not, in general, enjoy more of these various temporal goods, we may gather that more temporal goods are not, in general, more conducive to salvation than less temporal goods. Consequently, we shouldn't expect, on average, to become richer if we pray for money than if we don't, nor, on average, to be healthier if we pray for health than if we don't, and so on for other temporal goods.
This argument doesn't exclude the possibility that for a particular group at a particular time (e.g., during some period of the Old Testament), it belonged to the divine pedagogy to lead his people to faith in him through temporal rewards, both for doing good and for praying to him. It argues only that such temporal rewards of righteousness or prayer don't belong to the christian dispensation in general.
This conclusion doesn't mean we shouldn't pray for temporal things, but that we shouldn't, ultimately, pray for them in themselves, only inasmuch as they are possible means and contexts in which the "good Spirit" is given us. We should read the promise "how much more will your Father who is in heaven give good things to those who ask him", (Mt 7:11) in light of Luke: "how much more will your Father from heaven give the good Spirit to those who ask him?" (Luke 11:13) and the christian tradition of prayer, and so, when we pray for particular goods, pray for them only inasmuch as they might help us and others towards salvation.