Santoro, I would have no objections to your "run of 10,000" idea since you're putting the wheels in motion and (hopefully) bringing this to fruition.
I see and understand the logic behind NOT using MAME on the tokens. This is, after all, BYOArcadeControls, not BYOMameMachine. That is a point well taken.
Your idea for artwork submissions is a good one, as more folks may/might find out about this and thus ensure more sales, perhaps even making 'em cheaper.
I don't yet know how you propose to have funds submitted to you, BUT.... what about setting something up now and also start artwork submissions. That way, when the consensus is reached on the design, you'll be able to turn this out quickly, making everyone on all ends happy, and you'll have a better idea of whether or not you will be able to sell the OTHER 5,000. I'd hate to have you eat the cost, and don't mind that you'd make a profit. Actually DOING something has costs, be it mental work or physical work, and you have every right to charge for your efforts, after all, none of us wanting to buy 'em from ya have done anything other than say "yeah, I'd like some-o-dat".