No need to over think it. Just buy and buy until you can't.
I agree with concepts of not to overthink, and to just buy.. in a kind of dollar cost averaging way.. but frequently there does take some thinking to figure out how much you can buy without gambling or overextending yourself.
In 10 years, BTC is worth $3.2m... If it's less, that's still not so bad, but it will probably be higher than what ever price you buy today.
That is pretty optimistic, and it could happen. However, the beginning portions of an exponential curve (if we are in one) might look different than later portions. Furthermore, it is probably a lot more prudent to have a conservative range, including both starting from current price, and even if you are projecting up to also have some conservative numbers.
By the way, your starting point seems to be both high numbers and using ATH from 2017 as your starting point, so even your numbers should be more conservative if they go from a more reasonable starting point, such as current price, but I will note that if you count every year, a 2x every year still does get us much above $3.2 million in 10 years.
So, did some napkin math and it looks like, more or less, doubling every year.
2020 $50,000.00
2021~2022 $100,000.00
2022~2023 $200,000.00
2024 $400,000.00
2025~2026 $800,000.00
2026~2027 $1,600,000.00
2028 $3,200,000.00
Here's an illustration of a few differing scenarios of varying steady appreciation:
yearly/% 6% 50% 100% 150%2019 $8,000 $8,000 $8,000 $8,000
2020 $8,480 $12,000 $16,000 $20,000
2021 $8,989 $18,000 $32,000 $50,000
2022 $9,528 $27,000 $64,000 $125,000
2023 $10,100 $40,500 $128,000 $312,500
2024 $10,706 $60,750 $256,000 $781,250
2025 $11,348 $91,125 $512,000 $1,953,125
2026 $12,029 $136,688 $1,024,000 $4,882,813
2027 $12,751 $205,031 $2,048,000 $12,207,0 31
2028 $13,516 $307,547 $4,096,000 $30,517,578
You can see from these charts that even conservative estimates gives you decent returns, and probably more realistic prediction tables would show a tapering off of the amount of the annual return rather than keeping the annual return as a constant through the next 10-year period.