Inadequate capital is a reason a lot of businesses are not viable. Thus a reason to forgo the idea.

But to be more direct, it takes as much effort to run an umdetcapitalized smaller business as iIt does to run an undercapitalized larger one and in both cases you are hoping for luck.

Not only is hope not a plan, the upside of good fortune with a smaller business is smaller than the upside of good fortunes with a larger one.

Finally, adequate capitalization is the high level bit of designing a business. Ideas are so abundant as to be worthless and cash is king.