It's the law of supply and demand. If there's a lot of competition thailand business email list for a keyword , the cost of being there increases. And you have to be willing to support it otherwise you leave the way open to competitors. The success of a good PPC campaign depends on the quality of everything that happens after the click. What does this mean?
The website must be fast, effective. Sending users who are looking for something specific to a home page is not a good idea , the same goes if you do not study the internal paths that the user must follow. For this reason, the creation of the website is handled by a professional web agency.
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It depends on the sector and the product or service. Sometimes the amount you have to invest changes based on the time of year . Tools like Seozoom and Semrush can help you have a complete evaluation of the costs, which usually range between 1 or 2 euros per click. Although the amounts can vary significantly.

What is a good cost per click?
Some particularly high CPCs.
Some sectors provide a CPC higher than 10 euros but these are very particular conditions, where competition is fierce but conversion opportunities can make the difference.