Maintaining the balance may be challenging, but worst case I have the upper hand as the superior being. It is much like a mafia racket; you're spot on. And the mafia has existed a long time and many of the most prominent crime families have lived long, rich lives. However, in this scenario the "racket" wouldn't be totally one-sided like before. I would offer protection from foreign threats, and if they wished, crush foreign rivals.
Arbitrary symbols of "wealth" such as gems, precious metals, or currency would have no value to me as giant, nor would a luxury fabrics or extravagant wardrobes. Wouldn't even need a t-shirt. I'd good with a pair of shorts and running shoes, which ideally I would have brought with me before becoming stranded. My greatest assets would be human capital and control over it: based on what you have told me (and I now agree with this) I would need to maintain an equilibrium with the tiny people in order to meet my physical needs and survive. Taking a hundred cows (as you referenced) wouldn't be necessary when they instead agree to build a hundred factory farms, each with a workforce to match. Child labor laws are for them to work out not me. Even if I wanted to, it would be unrealistic for me to regulate such things
But you haven't come up with a better solution or even a suitable alternative than I have to the question: how else to satisfy male sexual needs as a lone giant amidst of race of people the size of ants or even smaller? As a fully developed adult male with a healthy sexual appetite, masturbating wouldn't fulfill the totality of it, and like any guy, I would still masturbate a lot anyway. Wouldn't you? And wouldn't you take advantage of the situation, like any proper guy would? Top down orders to their government and volunteers (which includes a brothel) being out of the question, there would no choice but to crouch down and take what I need by force. Gently pinching the tiny women in between my fingers and lowering them into my collection jar. Any husband or father screaming in objections tempts fate by gaining my notice. With a hundred or so wives and daughters trapped in a glass bottle in my pocket, yes, I would stop at around that number. Having enough tiny beings who can satisfy any inexplicable whims, caprices, and urges I have, at any time, by making them do any unspeakable yet stimulating thing on or to my penis to make me ejaculate -- that would serve both to satisfy my male sexual needs and fuel my sense of machismo. As a male you imagine it as unpleasant because it's another guy's dick. But they are women.
Truth told, I would even keep second glass collection jar in my pocket, containing tiny men who I use as a focus for all my frustrations. I could think of plenty of fiendish ideas to prank them that wouldn't be harmful: tapping my fingernail on the glass, shaking them. I'm a pretty active guy; there would be no showers. As mentioned, putting them to work cleaning my sticky, smelly feet at the end of each day would feel absolutely delightful. And that scale, everything would be magnified to them, so they may want gas masks or hazmat suits. But then, what fun is that for me? 😃 Again, you see it as probably cruelly unpleasant: is it that, or is it just harmless fun at their expense?