Look, you gotta face the facts- if you did not buy the ammo, you would just waste the money on non-essential things- clothing, food, shelter. Remember- one cannot be too wealthy, too handsome or have too much chocolate or ammo.
The price of ammo seems to have leveled off for right now, since the feeding frenzy has died down somewhat. Will it go down? I doubt that it will drop much. Will it go up? Well, look at the price of a McDonald's Cheeseburger over the past 20 years, and you tell me.
However, my crystal ball is still in the shop- problem with calibration, so I really can't give you an accurate answer. But you are asking a man with a lifetime supply of 7.62 Russian and 8mm Mauser if you should buy ammo????