This past Tuesday was a big day for Segulos for parnassa, there were ads everywhere about reciting Parshas Haman as a segula for parnassa.
Here is the Satmar Rebbe's (R' Yoel) take. One time a chossid came in to the Rebbe with complaints about parnassa. He offered the explanation that maybe he wasn't doing all the segulos for parnassa. The Rebbe answered as follows:
"אלע סגילת איז גוט אובער נאך אכט אזיגער שוין צי די ארבעט"
Segulos are good but only until 8 in the morning, after 8 go to work