Here is an interesting article, worth a look if you haven't seen it before.
Creatine: How Much Should You Be Taking? | Arnold Schwarzenegger
Basically, it advocates taking around 30 grams a day and it is not a sales piece (I did not see a link to or any mention of a product; besides, it is suggesting people take the mono-hydrate version, which is the cheapest anyway).
My question is, would it be safe to take this much?
Whether it would really do something beneficial is, in my opinion, a comparatively less important issue. Today Creatine Monoh. is so cheap that even taking 30 grams a day for a month is a very affordable experiment and worth a shot, just for the heck of it. Not a good idea, however, if it is potentially unsafe (obviously unsafe, if you have preexisting kidney issues; bit how about for those with no kidney issues... safe for them?)