Hi,
The user will have both groups "basic" and "advanced", depending the organization of the rights, the "basic" won't restrict the "advanced" part, specially if "advanced" in a child of "basic".
Please note that HikaMarket have his own plugin "vendor group after purchase" if you want to change the vendor rights and not the user rights.
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.