Crazy 2nd Hand Product Prices In Thailand

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I've lived here in Thailand for a while and have never really understood some of the prices people are looking at for their second hand stuff, its outrageous - are they just hoping someone will fall for it or do people really pay all sorts of silly money for something 2nd hand.

Example, a notebook computer was recently advertised for the bargain price of 100,000 Baht, second hand - This same notebook retails for less than 70,000 baht in HK and the USA. I could literally afford a return business class ticket to HK, two nights in a hotel and all food and entertainment expenses and pop back with this notebook brand new for less than the price of this second hand one.

Computer's tend to be the worst, I often see 2nd hand P4 2.0Ghz or similar with people wanting 30,000+ baht for it, because they paid 60,000 3 years ago - I can get a more powerful brand name computer for half that new. Often I see 2nd hand cameras here for sale at a higher price than one can find it brand new for in Thailand. Do people really pay these sort of prices for second hand goods?