Amiriliano: First of all just lazyness. I have made a lot of cheese lately and taking care of natural rinds are pretty time consuming.
I really wanted to wax, but I need a bigger pot for the wax as my current cheeses are too big for the pot I have now. I still consider waxing all the cheeses at some point.
Your cheese is much nicer with it's rind than mine without rind. I still find the vacuum bags to be a great way to age cheese after all - but the true artisan art probably does not come with plastic. ;-)