You couldn't make any profit from producing it, if it was that expensive to produce, but it isn't just exclusivity either. Creating a good scent that sells isn't free or easy, so those failures/experimental costs are baked in to the price. The ingredients used can also really be incredibly expensive, the bottles it comes in tend to be much fancier than the mass produced crap, and marketing the product is expensive. The price you pay for the stuff has to cover all that and still make a nice profit for the company.

It was just a temporary spike due to bird cullings. It might happen again with bird flu still being a problem, but the price spikes should only last as long as it takes to get a new generation of egg laying hens going.