From boxes of 48 (or more) plastic figures, to single command figures from Newline, purchasing figures comes with a variety of choices in terms of numbers.
No one likes having to buy figures you don't want & will never use. As I have a large box of "surplus" plastic figures, I guess the boxes of these fall into that category. Given the relative cheapness of these, that's not that much of a problem. The metal variety generally come in groups of 3, 4, 8 or more as a pack. As unit sizes are often stipulated by wargames rules, this sometimes means buying a full pack to get one needed figure. Spare metal figures are less economically satisfying.
I'm building a Lion Rampant medieval retinue. Units come in 6s or 12s. As I'm using my favourite manufacturer, Tumbling Dice, whose figures come in 8s, it means a number of extra figures have been bought.
This isn't so much a whine as an observation, and sometimes those "extras" turn out to be useful in expanded programs. I *do* have, however, lots of single figures, painted up & with no role in a game, just because I hate not to have them finished.
donald