Yes, please do educate yourself on that subject. I really like it. In our example we pay 99,- EUR/Month per company and we get: an address at a nice office building where we can register our company, receive mail (we get a email to pick it up), a local telephone number, a secretary who picks up that phone and transfers it to the appropriate employee of ours (his mobile) or sends an email with the contact details and a gold card which allows the use of business lounges in any of the 3000+ offices in 120 countries (incl. WIFI and coffee/tea). There are cheaper solutions (but I liked the gold-card service), and there are more expensive solutions (like with a permanent desk, storage or even furnished office space but we don't need that). I like the "pay-for-what-you-use-concept"... For several reasons.

Maybe the owner/user of that building (closed cinema at that address) simply decided to rent the postbox/address as a virtual office to generate a bit of income. Can be legit (that renting thing).

Doesn't change the fact Recyclix (one of those renters) is a Ponzi scheme...  

PS don't forget Madoff had beautiful offices (I believe in Manhattan or Wall street/New York) but still ran a (65 billion, sic!) Ponzi scheme ("that is considered the largest financial fraud in U.S. history).