Dear Jhayar, thanks for your reply.
The VIP bounty quests can be finished, but you have to be a VIP member to claim the rewards.
BTW, the VIP bounty quests don't take up the space of your normal quests, which means you can also finish other normal bounty quests.
You don't have to abandon those quests, you could just leave them there.
You suggestion about fixing this feature is reported.
Thanks for your support! Enjoy the game!