Hello,
Since HikaMarket provides a plugin for "Paypal Adaptive" and that plugin support "paypal classical" ; there is no need for vendors to create paypal instances.
The Paypal Adaptive plugin in classical mode already do what is require to have a fully working multi-vendor shop and will send the money directly to the vendor if he set-up his paypal email address and is the only vendor in the cart (thus the HikaMarket setting to limit the number of vendor is useful).
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.