> But there is no guarantee at all that you will ever turn a profit.
That's correct. And that's why most of your parents' money is in more stable investments. But if yours comes off, then they get a great return!
> That lemonade stand of yours might spend more than it makes for longer than your loan will sustain you.
That's also true. And if that happens, your parents don't have to put bad money after good. That's why it's important that you say what you're going to deliver, and if you deliver it, then they can believe you're on course. If you think you need $40, and you ask for $10 today, then they'll be happy to give you the $30 in 3 years when you need to open more lemonade stands on other streets.
> Which would require you to obtain another loan and so on. How many loans would it take before you would say: Maybe I really should start to make a profit on every glass of lemonade?
That's the point I'm making: your parents and you have an agreement and a plan. If you're sticking to that plan and on course, then we'll give you however many loans we discussed or anticipated you'd need.
> Or maybe you'd say: What a bummer, Joe from next door has also started a lemonade business, I wished he wouldn't subsidize his lemonade so much because I can't compete with him and his parents are wealthier than mine so they can keep that up longer.
This is an inevitable outcome that anyone in the lemonade business would have expected.
> It's not always a happy ending in the lemonade business.
:-)