I know what you mean, but you will - just wait. You're already justifying a keggle and corona mill (both not necessary).
I started out really cheap, too. I used an unconverted cooler, bucket-in-bucket lauter tun, a turkey fryer, and I bottled. However, since then I've added things like a 3-tier stand with burners, plumbing, etc., 3 keggles with valves, thermosights, and digital thermos, a kegerator w/ perlicks, march pump, barley crusher, CFC, thrumometer, and the list goes on. Clearly nothing on that list is
necessary because I made good beer before I had any of it.
That's just how hobbies are for me. Like I said before, I've got to brew A LOT of beer before I break even. The problem is, by the time I get there I will have spent more. I'll never catch up in this game, but I don't care.