I do wonder how many people on EC2 use SimpleDB because they need (or think they will need) the scalability, as opposed to thinking it's easier to code for, or

I do wonder how many people on EC2 use SimpleDB because they need (or think they will need) the scalability, as opposed to thinking it's easier to code for, or simply just so they can avoid the drudgery of running their own RDBMS.