Although never know, but am sure some just plain be 100% bought out, I'd never do that, but some don't want to trade.
When I was following a couple of systems that had very good records for 3-4 years, they updated saying they will no longer sell signals as it's not worth it, basically. I mean, you need a huge number of subscribers to make a lot and by that time, the slippage will be huge for most. So while C2 is great for people with skills but no resources, it's a losing proposition for traders with funds or ways to get funds.
It is too short to discuss. If OP are confident for future return, I can lend you money with 10% interest. But OP need half of the seed. All I need is annual 10% of the other half. PS) As an alternative, one possible way to express return rate for 10 years might be as follows. "For the last 10 years, my portfolio outperformed over BenchMark and always up in ANY period for 12 months (or 6 months)"