For what it's worth, you don't have to generate transactions with fees. However, transactions without fees might not be processed by the miners until they reach a certain age. The priority of a transaction is based on its inputs' age, values, and the overall transaction size as sum(age*value)/size, at least in the default client. Once that reaches a certain threshold of block age from the inputs, it will be allowed by the default mining code to be processed as a free transaction, as long as there aren't many higher priority transactions ahead of it.

You're taking it personally against other people because you can't understand the concept behind a 0.65% fee? Dumb.

It seems we have a troll  

There's no way to "pre-calculate" fees as miners are free to set the fee policy they want. This standard policy that's being followed by most miners is a set of arbitrary rules that were coded into the standard client, but these are not carved on stone or anything. Miners are free to come up with their own policies.

For kicks, I renamed a 150kb jpg to wallet.dat.  This was the response:


Phew!  Glad I got that one sorted out, I was afraid my wallet wasn't working right!