Just because I'm a bit bored and I don't have much to do right now, I'll try to explain why it doesn't work.
Let's say there are two stores. Store A is open 24 hours. Store B is open only a few hours each day.
Store A is not doing well while Store B is very successful, in fact they sell out of everything almost everyday. Yes, stores like these do exist, in fact there is a bakery near my house just like this.
Store A doesn't have well trained staffs, the store isn't clean, their product quality is poor, and they lack professionalism overall. It doesn't matter whether they are open all day or not. People just don't want to go there.
Store B has great products, the staffs are well trained, store is very clean, and people will get in line before the opening time because they are willing to wait.
Same thing with Fiverr. If someone sees a good quality gig, they will message the buyer and will be willing to wait for several hours for a reply.
The sellers aren't worried about being online all the time either because A, they need sleep and a life outside Fiverr, and B, they know people will message them.
I bet this post aint gonna anything, but h*ck, it's worth a try. 😅