On the subject of discounts (although I agree we're off the thread a bit here), if someone comes along and asks to buy, say, 100 coach dynamos in bulk then I haven't had to sit and count out those castings into individual packets, so saving my time and packing costs - which can be reflected in a discount. On the other hand, if someone were to want to buy 100 coach kits I would still have to spend all the time picking the individual components and then have the associated packaging costs, so what saving could I pass on in a discount? And if I haven't made a saving, why should I receive less income?
It all depends on whether stock sitting on a shelf costs money against a potential sale of 2 kits. Whilst profit is important a certain amount of turnover is equally important as inventory costs. 2 sales at a lower price providing there is still a margin may be better than no sale. Each individual business needs to work out what is best for them. Often if I am buying in bulk I'm happy for it to be all put in one box usually with only one set of instructions. If a deal can be done on that basis then it could be win win. Cash coming in can be reinvested in more stock which may or may not be replacement of items sold.