Yes 1% compounding, consistent over time is impossible, at some point your trading volumen gonna affect the price. etc if you buy $10.000 of BTC and sell it at $11.000, no problem. If you buy $500.000.000 of BTC at $10.000, and try to sell at $11.000,- not so easy. Your selling will affect the price.. So 1% a day is not impossible, if you are investing the same amount every day. Lending sites like this is compounding.