"I've got all my other soundtracks up, but not this one since it's all .midi."
Personally, I'm totally cool with just running through the midi files, but wouldn't it be pretty easy to batch-convert those midi files to mp3 (and optionally slap on reverb equivalent to RPGM) if you wanted to distribute it separately as well?
Though if the answer is just that such a task wouldn't be worth it if you've got a ton of tracks and expect very little attention and thereby return on investment, plus you're busy with your new RPG, then that makes perfect sense. I'm just asking since you say you have every other soundtrack up.