Earlier quoted context omitted.
There are no ASICs for Ethereum. It's currently impossible to get latest gen GPUs from any retailer, or for anything close to retail price on eBay, because there's a mad rush to get into Ether mining.
My recollection of how Bitcoin turned out indicates that most of those people will not make money. That, in fact, the simple rules of how markets work mean that most cannot make money, on several counts: * Those with resources will have an edge, and will buy an optimal number of GPUs to get return before the price is driven down * Anyone without resources will not be able to mine quickly enough to get a return before…
That certainly seems to be the consensus on the mining forums I'm following. /r/EtherMining is now inundated with people who lack the very basic skills needed to assemble a computer and run mining software, but are attracted to the prospect of free money. Many of those people also lack the ability to do basic arithmetic and the sense to realize that the only way they will turn a profit is if the USD value of ETH rises sharply -- and that if that happens they'd be better off in any case just buying ETH now instead of blowing $2000 - 3000 on equipment.