Well, everyone else has covered the ammonia thing pretty well. So I will make an attempt at answering your other question.
Tatjana has not been here now for awhile as she is in Europe and probably has been too busy to participate. But the reason I assume she keeps so much ammo (the reason why most of us who stock large quantities of ammo do so) is because we want to prepare for any means of interruption in supply.
Take the environment after 9/11. Many people don't bother ever being prepared, so when a situation arises, people tend to rush out and buy up ammo fast. So many people feel it is important to have whatever they think they may need on hand, in case it isn't easy to get later when it may be needed.
The quantities of ammo people wish to stock will differ. There's a long standing standard of 1000 rounds per rifle, about 250 for pistols, etc. Many feel that is sufficient. Others wish to put away all the ammo they think they will ever need in their lifetime, and that's alright too. I'm not sure how much ammo Tatjana has, but if it is 80,000 rounds that she feels she needs, then no less than 80,000 rounds will do! Is it overkill? Probably. But I would rather have too much ammo than not enough. Again, it's all in the eyes of the individual in question. Some people feel comfortable with 500 rounds, others 1000 rounds. And some may not feel comfortable with less than 100,000 rounds!
While such a high round count seems excessive to some, one thing is assured...if nothing else, you will never have to buy practice ammo again! And in a worse case scenario SHTF type situation, you know you will never run short on bang.