Signal vault passive RFID cards on shark tank cost on .75c US

Signal-Vault cards only cost 0.75 cents which is similar to cards sold in China via Alibaba. These cards retail for $14.95 retail. Seems a huge profit for what in effect is similar to just another programmed mifare RFID card (just like a credit card) but programmed to spit out garbage when interrogated in the hope of fooling a reader.