That might be ok for technical people who are used to this kind of "machine speak", but for end users it's often not acceptable. Consider the difference between:

    Purchased credits: %d.
    Remaining credits: %d.
    Buy more : 5 [link] / 10 [link] / 20 [link].

and

   You have purchased a total of %d credits and have used %d of them so far. You can buy [drowdownlist] additional credits by clicking here [link].

Which one do you think will have the highest conversion rate?