Then would it be profitable to invest in ASICs? I couldn't see them as a resellable good.
It could be extremely profitable to invest in ASICs, but it really depends how soon you are able to get your hands on one. The first ASIC miners will make a lot of money, the last ones not so much. As for resale, ASIC's can only be used to mine bitcoins, so resale would be limited to selling to other bitcoiners.
Well said, those who et the first ASICs will have 100% ROI within a month or 2, whereas those who buy 6mos after realease may take 6-9mos for the same ROI