Hello,
The "contact us for more information" is a feature provide by HikaShop.
HikaMarket do integrate with it in order to send the email to the vendor instead of the email configured in HikaShop.
To add such kind of restriction, I recommend you to open a new thread in the HikaShop section of the forum ; it might require some view customization or even plugin development.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.