First of all, Steam being profitable doesn’t mean anything, because Steam is not a company. Company is Valve Corporation. Also please don’t confuse profit with revenue. Valve Corporation has a very high revenue, but their profit is not disclosed anywhere. I don’t live in the US, so I don’t know how to check what their tax man knows about them, but I don’t think they have much profit and pay much taxes.
Also if you actually have a small business, then you would know, that you don’t want salary or anything that incures taxes. You will buy yourself a car without VAT from company profit, you will fill it up with petrol from company profit, you will buy yourself new laptop from company profit, etc. But you’ll keep your salary as low as possible and you’ll avoid paying any taxes, including VAT. Everything that can bought through your company legally will be bought through your company and then some.