I was quite surprised to notice the message "20 remaining mp3 exports available - please purchase the mp3 export pack from steinberg" (or something like that).
I thought that was a bit cheeky, really - I've brought a product from them and certain features stop working after a while until I give them some more money? Fat chance. Like there's not enough free wav->mp3 converters out there...

Royston (using free mp3 converters...)