As long as the legal maximum price is high enough that the seller can make a profit, the seller will change his behavior and sell the water for that price instead.
"Make a profit" is not the limiting factor. "Make enough of a profit to make it worth scouring the desert for thirsty people" is. If I'll get $3 for a glass of tap water, I'll sell it to someone who knocks on my door. If I'll get $100,000 for it, I'm going to rent a chopper and fly around the Sahara.
I stand corrected, but that doesn't really change what I'm trying to say.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.