He planned on profiting from the rebuilding effort. He actually states it, in a delusional way, when talking to the priest. It is his actual goal. He want to be the primary means for the production of the rebuild and will use the additional resources he gets from Evil to do this.
He does not realize that there won't be a rebuild effort and that everything and everyone will die. He is deluded by corruption and profit/business only. The idea of it is capitalist without morals gone as wrong as imaginable.
Also he may have rationalized it as Evil was unstoppable so he wanted to 'serve' him to get out of being destroyed. In addition to that, Evil might have poisoned his mind or been lying to him. Zorg was already a Corrupt and morally bankrupted person, so to further corrupt him wouldn't take too much persuasion.
At least that is how I interpreted it. I love this movie too and Zorg is just such a fun evil character I can overlook some of the short comings of his long term plans.
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