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It may be less costly, but if it does not meet the requirements of PCI DSS (Payment Card Industry), it's not allowed.

From the second link below:

"The wireless requirements for PCI DSS relate to whether or not the technology is part of the
Cardholder Data Environment (CDE). The CDE is the computer environment wherein cardholder
data is transferred, processed, or stored, and any networks or devices directly connected to
that environment."

https://www.pcisecuritystandards.org/pdfs/pcissc_overview.pdf

https://www.pcisecuritystandards.org/pdfs/pci_dss_wireless_guideline_info_sup.pdf