[Dynamo]

My suggestion would be do something like what freedomain.club used to do. A request page, when you apply, $100 will be deducted. If you win, you will be notified via email, if you don't win, the $100 will be refunded.

We still haven't introduced any system like buying from their virtual credits(we would be deducting $100 manually),
and we only want to apply this for those registered users who had a VPS in their past to control the abuse.
So I don't want to make the thing more complicated for us as well as for our users that's why we would deduct the $100 when they get a VPS(registered users who had a VPS in their past) manually.