[monkeybutton]

All of the advice you've received here is good, you shouldn't sacrifice your personal security no matter how good it looks.

But! To provide a contrarian example, one of guys involved in creating Guitar Hero faced this exact dilemma and took out a second mortgage on their house in order to fund the first round of production of guitar controllers: https://www.vice.com/en/article/wx8bey/the-oral-history-of-g...

The circumstances were unique because at the time investors were extremely hesitant to fund specialized hardware runs. His gamble paid off handsomely but it's probably the exception to rule.