WoW that's great! As I often travel to the Strasbourg region it'd be an easy visit to you. If you do begin to support Warzone products, be sure I'll drop by!
Ich freue mich schon ;o)
And just for your question: no, the retailer program is not the same thing as the crusader program. You can be retailer as well as crusader, however it's not mandatory.
Retailer = sells Warzone products
Crusader = promotes Warzone and brings the crowds to the retailer ;o)