If you buy a 100 TH/s contract and let it run, you will make a solid ROI. But if you take the daily yields from that 100 TH/s contract, and use them to buy *another* contract every time you hit the minimum purchase threshold, the math goes parabolic.
The Accumulation Phase
Set a timeline for yourself—for example, 6 months. For those 6 months, pledge to never withdraw. Every time your mined balance is high enough, purchase a new micro-contract. Your daily payout will inch higher every single week.
Month 1: Earning 10 XRP per day. Reinvest.
Month 3: Because of reinvested contracts, you are now earning 15 XRP per day. Reinvest faster.
Month 6: You are earning 25 XRP per day, and decide to switch to 'Harvest Mode.'
The Harvest Phase
After compounding your hashrate to a massive level, you stop reinvesting. You now withdraw your inflated daily payouts directly to cold storage, dramatically outperforming what your initial capital alone would have generated.