These one the base things in stake.

I even can get 10$ without waggering at all. As long you waggering in the previous weeks, you can get at least base amount until is decrease for the next 1-2 weeks. The first one 10$ next could be still 10$ or 6/7$ going to 4/5$ soon.

Tried testing maybe, at the time the bonus is decrease without waggering next weeks you waggering 10,000$ and next one don't waggering is still 10$ or not.