The real problem is the daily charge. If the buyback is close enough to the purchase price you can make your night time (off peak) costs balance your generated income. When you have a high daily rate you have make up that difference before you can break even. I just switched to a provider with a bigger buyback/purchase difference but lower daily and will come out ahead because of that. Got tired of sending 2x more kWh to the grid than receiving and still ending up in debit.