know somethen about making a webpage? Answered

ok so im thingking abount making a webpage but i have a question...you know those PPC (pay per click) things you can get from like google.com? well technicaly couldent somebody just click on the links 100 times and make money, or is it only a one click per person kinda thing? oh and im not trying to rip google off or anything i just had this random thought