Attention has a ten minute shelf life
Someone sees your video at 11pm, comments, and forgets you by morning. If your reply lands within a minute while they are still scrolling, you are selling to a warm buyer. An answer the next day is a cold lead.
"How much" is a queue, not a conversation
A video doing numbers produces hundreds of identical questions. Answering them by hand means you stop making content, which kills the reach that produced the questions. Automating the first answer is what lets you keep posting.
Move fast, move to WhatsApp
TikTok DMs are a poor place to sell: no payment, weak search, easy to lose. A link that opens WhatsApp with "I want the 30,000mAh power bank" already typed puts the customer in a channel where you can invoice, remind and deliver.
Know your cost per customer per video
Because every chat carries the video it came from, you can see that one review video produced 40 orders and a dance trend produced none. That is what decides your next ten posts.