Hmmm interesting discussion.... this can apply to any item actually and not just cels. Unless you believe that somehow you can (or should) control the market and be the price setter here. We can rail and talk all you want but in the end its how you spend your own money versus others. Personally it may make you feel better to express opinions and be comforted that there are like minded people (no matter which side you support). However, in the end it is indeed an open market (well except for those where seller refuse to sell to certain segment e.g. proxy). Again speaking for myself.... I might have bid on a cel even knowing its high.... if I just had to have it. In this case I did not.
On the topic of ethics, I don't think there are any here. We are not talking about cancer drugs (or other lifesaving stuff) nor public goods (like water). So its simply willing buyer willing seller that's it.