As an added incentive, this latest update implies that Monkey is not slated for the default transformation list. Now, I don't know about you, but I'm pretty sure I can't stand for this. So go ahead and pitch in at the Contributor level if you have the cash. Do it. For Monkey!
If I were rich I'd go with the $10k one just because I loved Shantae so much. Not many GB/GBC games were to my liking due to the limitations of the screen and the system, but this was most definitely my favorite.