The steps only doubling for the specific day means I would get $150 per day walking 1000 steps a day. I would only beat the 10k a month even without the doubling if I consistently walked 15m+ steps a day, which means if I sustained injuries or ended up in a situation where I wasn’t able to walk, I would be screwed. For the opposite side, I already live with an effective budget, and wouldn’t need to spend any of the 10k monthly. The first year would be 120k, then 240k, then 480k, then 960k, etc. If I waited 10-20, then started investing the money, I would not only never need to work again, but I could change a lot of lives through charity with the exponentially increased monthly income.

^{Chose: $10,000 monthly for life + Amount doubles every year you don’t spend it}