It seems like a purely promotional placement, Amazon isn't giving you money that neither you nor they received -- that seems perfectly reasonable to me. If you don't want to bear the auxiliary costs like server load or customer service, you don't have to agree to it.
If Amazon is correct, though, this promotion should mean that post-promotion sales are higher than pre-promotion sales. But the chart ends on the day of the promotion. Though there's a little text about it, I'd be curious about more detail on how things are shaping up afterwards.
Either way, up to them of course, but it feels a bit extreme to me to abandon ship because of agreeing to an unsuccessful promotion and because they're behind in features vs. the Google market.
If Amazon is correct, though, this promotion should mean that post-promotion sales are higher than pre-promotion sales. But the chart ends on the day of the promotion. Though there's a little text about it, I'd be curious about more detail on how things are shaping up afterwards.
Either way, up to them of course, but it feels a bit extreme to me to abandon ship because of agreeing to an unsuccessful promotion and because they're behind in features vs. the Google market.