The worst customers you could possibly have are those that have paid a trivial amount (say less than $10) of money.<p>Just like there is a price-elasticity that has shows a curve that says that <i>any</i> price at all is a drawback to adoption, the customers that pay $100 for something are most of the time not such jerks as the ones that pay $5.<p>For $5 everybody somehow expects stellar personal service and attention, whereas people that spend $100 are a bit more mature and more likely to see both sides of a story.<p>In fact, they may simply wait until you are ready to ship.<p>The fun thing here is that even though both parties are 'in the right' in demanding they get top notch service you may not be able to deliver that service at a pricepoint that is too low. Even for a pre-order you have to make that calculation.<p>That's why it is a good thing to research your support costs before you commit to a certain price.<p>At a $5 pre-order you are simply asking for trouble, the barrier to entry is so ridiculously low that you will get a large number of people that will simply cross the threshold that might not have bought your product at full list price at that moment in time.<p>You essentially sell a promise for $5, if you are not 100% sure of your ability to deliver on that promise you are setting yourself up for a pretty nasty fall.