Profitability is always the first priority in producing anything commercially. I didnt mention this as top priority as it is a given. Do you really think the small amount of profit that AE or any company will gain by you having to buy seperate front and rear sets of arms offsets the increase in tooling costs? And given that front arms give way far more frequently than rear? You are completly nit-picking here. Next you'll complain about the money hungry R/C companies not selling single arms seperately, or buying diff balls in lots of 12 when you only lost one. What happens if you bend a rim? You have to buy 2 rims, 2 tires, and 2 inserts. Darn those faschist R/C companies trying to keep the average racer down.
Sounds like your just complaining to hear yourself.