Would it be worth the extra bookkeeping to have weapon or armor properties that weren't just +1 or +2, but maybe +1.5? I mean, the math is really simple (it's still n * n * 2000, or 4500 for a +1.5) so it doesn't seem like that much extra bookkeeping to me. I keep coming up with ideas that should definitely be a plus-equivalent bonus, but they often seem to not fit well with the current whole numbers.
Anyway, this is mostly just for discussion. Unless I see some official items using such numbers, I probably wouldn't try and use them myself.
(If you happen to be interested in math, there are several other fractions that will still give whole numbers for the price and cost.)
