I have a client who i have been experimenting with their product on google adwords, more specifically the shopping ads section. My campaign is well, My ratio is about for every $10 my client spends ,my client gets $80 in return just today alone. But my problem is, my daily budget is never fully spent. which is killing my scalability. My testing budget is $16.5 a day, but for some reason im only spending $4 or $6. Im making good ROI but i need start spending way more to scale it. No other campaigns are running or sharing the budget. Any ideas?