I used to only buy from Kobo if the price was appreciably less than Amazon -- which usually meant only when I could use a good coupon. I bought all my agency books from Amazon.
Then Kobo introduced their point system. I joined the VIP version when it was discountable and had a free book that I wanted, making it effectively free to join. Now I buy all my agency titles at Kobo to get the points and for non-agency books I buy from Kobo unless the VIP price is appreciably more than Amazon's price. I've also taken advantage of one or two promotions when I got five times the basic number of points. My default is now Kobo rather than Amazon.
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