What annoys me the most is that you can't make any sort of offer for 50 bushels, but you can make an offer for 150 bushels which seems pretty common. With no option for 50 bushels you can't broker a 150 bushel deal with smaller ones. It's actually impossible since there's no 25 bushels offer either or even 75. You need that exact offer to be able to fill it, making brokering for traders a pretty useless proposition.
This pretty much applies to anything with a 50 in it, though once you go to 250 you run into the option of filling it with a 100 and 150 bushel offer and so on, but those are much rarer to come by than smaller ones, making the order once more difficult if not impossible to fill.
So I'm stuck looking at sell orders for 20 or 40 or 60 bushels and can't do anything with them. They're completely useless.
