My infrequent reads and writes are huge, and possibly spikey.

> Write Throughput: $0.0065 per hour for every 10 units of Write Capacity (enough capacity to do up to 36,000 writes per hour)*

> A unit of Write Capacity enables you to perform one write per second for items of up to 1KB in size

As I understand it, for $4.68/month I can only add 36 MB/hour, and thats assuming my objects are in exact multiple of 1KB.