Volaris does not provide WIFI access on any of its flights.
Everything You Need to Know About Onboard WiFi and Volaris WIFI
Why it is so expensive and why paying more does not ensure faster service or a higher quality of WIFI aboard, as it depends on the airline (in this case, Volaris WIFI), aircraft type, in-flight WIFI provider, and location:
Airlines-wifi.com is a complimentary service that offers WIFI and internet access onboard for all major airlines, including Volaris WIFI. This website has no affiliation with any business or federal or state government departments, offices, agencies, boards, or commissions.