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I myself had won the NT$200 prize for like 8 times in a 3 year period during my stay. It encouraged me to buy more stuffs using that money and increases transactions, boosting economy. Genius indeed.

It's pretty common to buy something then be asked to pay 5% more if you want a receipt - 5% being their sales tax.

Wut?! No, they ask you to pay 5% more when you want to pay by card: it's the Visa/Mastercard fees.

I've experienced that kind of shenanigans in Vietnam, but never in Taiwan. What did you buy?

Electronics

I've never, ever, been asked to pay more for a receipt.

have you ever asked for a receipt where one hasn't been offered?

Yes. And never heard of any additional cost.

Well you must go to classier places than I do (:

How exactly does the printing of tickets work? Most countries have special machines (owned by the lottery authority) for printing lottery tickets, but this seems to be built into the store’s POS?

Thanks for reminding me to check all my receipts, see if I won anything tonight!