Hello,
I think there is a misunderstood, a massaction will impact existing data (in Data Base), here you create a new element (here, the price) and as well a new database entry, the system won't change future database element.
Now, if we understand you well from your last message, you want have pre-selected by default a specific usergroup each time you set a new element, but unfortunately that's not possible without custom code in HikaShop, and Joomla core file (As Acl system is Joomla dependent)
Sorry for this return.
Regards