Parshas haMan and segulos

Is it really conceivable that one can have the same attitude toward Torah and mitzvos as yesterday, the same chovos/zechuyos, and by magically reciting an incantation of a single parsha of chumash (the parshas haman), can tilt the balance in shamayim to have a better parnasa? Maybe you can cite the sugya of "simana milsa" as a source, but overall, I find it hard to digest this type of approach.