There is actually a much more complicated reason to this than people realise.
We have distributors in each continent I.e. Flush in Australia and Prometeus in Europe. If we make an international version it needs to have two different profiles for each of these markets (ignoring Canada for now as we aren't well stocked there).
So, all of our products go through them, they are the people to order from us prior to it going to retailers.
Essentially, there has to be demand.
If we make 5000 tubs of an EU formula and the distributor only buys 1000, we have 4000 units sitting in our warehouse and can't do much with them.
Long story short, we can make an EU or AU specific formula but it needs to be requested by the consumer. These requests trickle their way upwards and then the distributor will request us to make a flavour batch for them.
I hope that makes sense.