What happens if not enough people put money into your "investment" in order to sustain these kinds of returns
You have to understand how PAMM accounts work, they're proportional. If master account has 100 LTC and makes 1 LTC today, that'll be 1% daily profit. If that master account has 2 slaves signed up, 1 with 100 LTC and another with 1,000 LTC, they'll both make 1% today. 1st slave with 100 LTC will make 1 LTC (1%) and 2nd slave with 1,000 LTC will make 10 LTC (1%).