Help with my ADWORDS Please!

window.document.getElementById(‘post-3845’).parentNode.className += ‘ adhesive_post’;I am sellnig a product that has been getting me about 5 sales a day and about 50-80 visits.
Well, my product sales have gone down DRASTICALLY with the entrance of some big players who are outbidding me…
But I think there is more to the case. I see I still get many clicks, and my CTR is about 5%.
Yet I am not getting any sales.
Could a competitor be clicking my ads on purpose?
How can I tell?
Does google track IPs and not allow charges to happen after one click, etc?
Any tips on how to get to the top of a the ad-list without paying a lot? I feel my quality score is good. BTW, how can I check my quality score?

Original post by mbomb