Is it only me thinking that 5000 is just a high number put there to be sure that it won't be reached and everybody who wants can get a tablet, and production batch size will be decided upon the number of backers?
About another subject, Chen, will you make tablet spare parts (above all display and battery, but connectors and full motherboard would be nice too) available for purchase somewhere for DIY repair? Possibly Aliexpress or eBay would be fine too.