Does Advertising Pay Off?

Got an offer for 50EUR voucher to do some European advertising on the Bing. Since it didn't cost me anything, I took the bait. I am expected to get around 300 click in the month that the campaign is running for my related keywords.

It's for the post I wrote to review ayurvedic anti-aging skin care regime package including skin care products, the kansa massage wand and 2 DVD set; one about ayurvedic approach to aging and other about the use of kansa wand.

I have not really tried paid search engine traffic before. My paid traffic experiments so far have been few failed expensive advertising attempts on Facebook which brought absolutely no results what so ever and few successful 20EUR advertising spells on reddit which actually were really great for directed traffic.

So this is something something relatively new for me. I also have an Google Adwords voucher for 75EUR, but to claim it I need to spend 25EUR of my own money, so I have been doubting if it would be worth it.

Has anyone tried advertising on Bing and seen any results? Would the Google Adwords offer pay off? How much do you pay for advertising per month? Did you try both and which one was more successful?

My traffic to my site is still very low, only 9000 visits last month. I made 2500EUR commission on the ayurvedic products that I am promoting last month via my website, how much would advertising improve this?

I am not planning on advertising any of my other services such as ayurvedic treatments, ayurvedic teaching, private art, yoga and meditation lessions, because I am not up for the work at the moment, but products are easy money, as I just need to answer to some enquiries questions.