You're certainly welcome to purchase any of the white-label services on your own workify site. You might have a couple reasons for wanting to do this:
Help marketing your workify site:
You can purchase any of our services if you'd like to utilize them with help marketing your workify site. Let's say you want to build up a social media profile, create Facebook Ads, etc. Just purchase and enjoy the boost!
Re-selling to your clients directly:
If you'd like to up-sell the services to your clients (since you cannot adjust the price), or bundle some services and sell a package to your clients, no problem. What you would do is purchase the service (or set of services) yourself, work with the worker to complete the project, and then re-sell to your client off-site.
For any of the services on your site that you purchase, you'll receive a portion of the purchase price back -- just as you'd receive if one of your customers purchased themselves.
If you're purchasing to re-sell to your clients directly, you would then be the point of contact with the provider and receive the deliverables on their behalf. For all onboarding forms you're instructed to fill out, you would enter client information.