If I'm understanding your argument right, I think you're saying that because we try to evaluate how much people should be paid in a rational way that includes some assumptions around time being correlated to amount of work, that means we are "profiteering". I'm not sure that's worth dignifying with an answer, but here goes:
GrantTree is a business. We need to make a profit in order to continue to exist, to grow, to be an exciting place to work, to have the resources to invest in our people, to be able to develop new products, and so on. We also need to compete against other businesses in the same market, some of whom are quite aggressive. If we get the balance between people's contributions and their compensations wrong, we'll be uncompetitive and won't survive. It's that simple and has nothing to do with profiteering.
Ultimately from your description it sounds like the increased non-profiteering wages would not come out of company profits. Thus in the end it's just like all the other businesses then. No need for all the flowery language about how there's other priorities than making money. If you had to ditch everyone and go to Malaysia to "be competitive" then you'd do it.
I'm in 100% agreement with you. So you do pay less to those who work 4 days a week. That's fine and it makes sense. Just confirming.
Then I don't even need to ask: you're also saying that for every hour over 8 hours staff is paid overtime? That would be consistent with paying 4-day a week folks less. And would be the nail in the coffin that profiteering isn't your main motivator.