Have you guys been part of some design job marketplace or just design marketplace?
If yes, did you have any experience to be a pro user/ member who gets more benefits by paid plan and which marketplace was that?
I am not sure if investing will always work tho 
once I paid as a Dribbble pro user but not much job inquiries I got.
But I wonder if you guys have success story with this kind of professional investment Thanks!
I can’t think of a site where you pay money and people throw you work to do.
Those things are not what the professional designers use. They cater to lower end, off the shelf clients who are looking more for a pair of hands than any kind of design/brand direction.
Aim Higher.
I think that makes sense too.
But some job marketplaces could give sort of benefit compared to reguler users, for instance to have better rank in their search system result or to have better features or functionalities in the user dashboard.
I have never tried paid plan but Dribbble, so that’s why I am curious if it will help to get better exposure of my professional service somehow 
Are you doing this for a hobby or looking to make a living at it.
Look at it this way, are you going to make enough money to earn back the money you spend for “better exposure?”
Plus living expenses?
They aren’t promoting your services for you. They may give you better placement but if your portfolio isn’t speaking to better clients, what good is that? Does the site give you portfolio space? Or can you only show previous work done for their clients. Sort of a Catch-22 there.
Besides, if you decide to move onward and upward, work done for such websites doesn’t necessarily count in anyone’s book as “experience.”
Personally, I wouldn’t waste my time or money.
But that’s just my opinion.