Sure, an unused $300 milwaukee cordless is a waste, definitely don't buy something like that before you need it. Especially since there's quite a few choices available.

However a 6 piece Wera screwdriver set is $30-35 and easily to justify in any apartment or home and should last dramatically longer than a dollar screw screwdriver and MUCH less likely to cause damage to whatever you are working on. Even building a piece of Ikea furniture and the most minor of repairs (light switches, door hinges, loose chairs, etc) would justify the wera set.

Much better to buy something decent set for $35 than might last a lifetime of light use than the nearly disposable dollar store stuff. Even a small apartment can justify a handful of screwdrivers and allens.