It costs at least 5430 satoshis to create an output at the moment. 
Is the same spam limit applied if the script is OP_RETURN?
If not, I would be concerned od opening a cheap spam.

Tamas Blummer

On Mon, Feb 24, 2014 at 11:39 AM, Wladimir <laanwj@gmail.com> wrote:

> 
> And if this is not abused, these kind of transactions become popular, and
> more space is really needed, the limit can always be increased in a future
> version.
> 
> Wladimir
>