Hmm, how about in addition to what was previously mentioned.
Two ideas:
1. You get 5% of your referrals deposit tacked onto your total deposit. Meaning your total 150% grows. For example, you originally deposited .001 and your referral deposited .005. Your original total return would be 0.0015, your referral tacked on 0.00025 to your total deposit, meaning your new total return is 0.001875.
2. A little simpler, your referral deposits Bitcoin and you get the original benefits along with 5% of your referrals deposit. If that 5% is less than .0001, you get automatically get .0001 instead. Basically 5% or .0001, whichever is greater.
Sounds better.
If I were you, I'd implement this right away.
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PS: What is your current revenue from the ads?