Transaction fees are set by core developers, not by the market

[Come-from-Beyond]

Satoshi's client doesn't allow to set arbitrary fee (0.00000001 BTC for example) via interface. WTF?

[EmperorBob]

Use a different client. Then watch as no one relays your transaction. You might also be able to do it by providing a command-line flag at boot (I have not tested this):

-paytxfee=<amt>        Fee per KB to add to transactions you send

Right now the effective fees are just the default ones in the software. There's plans to make this more dynamic https://gist.github.com/gavinandresen/2961409.

[alp]

Satoshi's client doesn't allow to set arbitrary fee (0.00000001 BTC for example) via interface. WTF?

Whether or not to use Satoshi's client is decided by the market.  Game over.

[Trongersoll]

Satoshi's client doesn't allow to set arbitrary fee (0.00000001 BTC for example) via interface. WTF?

Are you sure? I'm using bitcoin-qt and i managed to get it that low playing around. check the pull-downs.

[pedrog]

Satoshi's client doesn't allow to set arbitrary fee (0.00000001 BTC for example) via interface. WTF?

Watch this: http://www.youtube.com/watch?v=JfF5mJDgZWc

I believe Gavin addresses this issue, sorry I cannot point to the exact minute.

[The 4ner]

Satoshi's client doesn't allow to set arbitrary fee (0.00000001 BTC for example) via interface. WTF?

I wouldn't call it Satoshi's client anymore. It's more of The Bitcoin Foundation's client. That I know of Satoshi no longer works on the development of the Bitcoin wallet.