That's funny. I've never heard of anyone I know having to replace the cheap rubber-dome keyboards unless they spilled coke in 'em. Besides, if you hypothetically had to replace a $5 keyboard once every 6 months, how long would it take you to make up the same amount of money you'd need to buy one of those mechanical keyboards? The cheapest Cherry keyboard I see listed is $70. That's 7 years worth of cheap rubber-dome keyboards. /shrug
[edit] Also, after 12 years in the PC OEM industry (which is like 98.5% cheap rubber-dome keyboards) I've yet to hear anyone complain about ghosting or any of those other failures you mention. All the failures I've ever seen on production keyboards have been due to breakage (coke, rage, rain, etc.) or bad solder/compression joints on the PCB where the matrix connects.
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