A wise plan, but you forgot "Booze" and "Profit?"
I keep a very similar budgeting scheme (now lamely anti-gun, due to a focused savings effort toward a down payment), but I also keep an inventory of much of my 'gun stuff.' Unlike most dumb hobbies, gun stuff is quite valuable in and of itself, so keeping track of it is a good way to have a better understanding of where your actual 'wealth' is, as opposed to what is officially in the accounts. I don't plan on making money on my gun stuff (though I will, given even a few years maturation) and I certainly don't make decisions relying on it as a backstop if something goes wrong --but it is nice to know what is there if I lose an arm tomorrow and have to sell everything to staunch the bleeding
TCB