Do you guys really care if someone tries to make a few bucks on eBay? It's not like he is forcing people to buy them. He may make a few bucks, lose his ass or somewhere in between. But do you really care?
Two reasons:
1) It inevitably makes it that little bit harder for legitimate customers to get hold of the device they want at the price they should be. I suspect most people reading this have at some point been trying to get hold of something in short supply and scalpers make things way harder than they should be.
2) Scalping in general is a pain in the arse and the world would be a better place without the practice. Ultimately it leads to the mess we currently have with concerts with hundreds (or even thousands) of tickets being bought for resale, prices going up and genuine customers getting screwed over (either on price if bought through said scalpers or with fewer good tickets available). In addition you have the murky world of the scam artist who offer products that never turn up, aren't as described etc and people loose a lot of money to them.
And as a secondary reason the people that do it typically lie like hell about their reasons for doing so, witness the OP's "I'm just doing it to help people" line above. Can't help but dislike people that do that I'm afraid, just ain't honest...