Massive companies also have low average profits, but it’s not low quality driving down profits so much as growing to the edge of unprofitability because high profit margins are not inherently as useful as total profits. If say Budweiser increased their price by say 10c a can their overall profit would decrease even if their profit margin would increase.

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That's not neccesarily the case. The ideal price point for maximum profits is ever-changing.

Would Budseiser's profits increase if they lowered the price by $0.10?

The answer is the same: it depends.

Revenue and Profit are intimately intertwined, with their cousin Cost riding shotgun.

So, after 1 week you have 20k in gas and 100 - 19 = 81k in cash. You need to spend 80k of that on more gas for text week resulting in a net profit of 1k or a 1% profit margin.

But, repeat that for one year and you bought 80k x 52 weeks of gas = 4.16 million even though you only had 500k in capital. Further your profit margin might be low but your ROI was 52/500 or 10.4% which is not bad.

But that's not the scenario at all. The scenario is about sales, not capital investment. The point is that its very unlikely (for retail at least) that you need to invest $X of capital in order to sell $X of merchandise. The question about returns here is not about returns on capital investment, but profit margins on sales.

You make the 20% with the 100k, and hopefully find similar opportunities with your other 9 stacks of 100k's.

Profit is the only driving force in the market.

The comparison is not about investing $X and making $Y profit. It's about selling $X with a given profit margin.

The actual capital requirements to sell $X are assumed to be roughly the same for both scenarios.