I did this as well a couple months ago. The keyword "dropbox" got 99% of the clicks at around the same cost as you $0.13 cpc. I wound up spending $65 on ads (wi

I did this as well a couple months ago. The keyword "dropbox" got 99% of the clicks at around the same cost as you $0.13 cpc. I wound up spending $65 on ads (with no voucher sadly) and now have 16GB of free space.