Voipbuster - Free for the mathematically challenged

We often see people talking about getting "free" calls by using Voipbuster.

I don't get it. If I understand correctly, the way it works is you have to give them 10 EUR (about $15 USD) and that qualifies you for a maximum of 300 minutes of "free" calls per week to specific "free" locations for a few months (each call limited to one hour). Then you have to "top up" (put in another $15) to make more "free" calls.

When I do that math, it sounds more like I'm paying $60 per year for a limited amount of "free" calls. Regardless of the annual total, it sure as heck isn't "free" - and you still have to pay for calls to "non-free" numbers (most mobiles outside the U.S., India, etc).

Wikipedia says

"company continuously increases its prices in some hidden ways. It changes terms constantly without notice"

and

"Latest feature seems that the 10 euros you pay to get 'free nations' can no longer be used as credit, you lose the money after 90 days. Any non-free destinations need a separate 10 euro credit."

I don't understand how this company has such a great reputation on the blogs.

In short, caveat emptor.

Note: The company behind Voipbuster, Betamax GmbH & Co KG, runs dozens of other services under many different names, all with a similar scheme (see this site for more information).