Ppc is not especially good for all website. If your site received lots of traffic then ppc may not be the right choice for you. Ppc seems to perform better on medium sites, but it will work on large and small traffic sites. For high traffic sites, a cpm (cost per thousand) impressions seems to perform better. --- Ppc is pay per click.
It's also suitable if you have a good site content, like with AdSense if your site has good content and the ads match your content you can earn very high for ppc.
lol that's a very weak business model. I never got into PPC arbitrage but I have been told it's not very profitable anymore.
Actually with AdSense quite not, because if you have good content and keywords they can pay you like $10 per click which I believe is pretty good compared to other ppc ad networks that pay you like 1 cent per click. But of course you will not be getting like $10 per click everytime. I did not try ppc for e-commerce businesses, so I'm not exactly sure how ppc performs on that content.
I don't think PPC good only for e-commerce businesses. its good for all type of businesses and its depend on your choose keywords and bid on that.
I definitely agree with you on that as well. I think ppc is not only for e-commerce is for other business and websites too. But you may have the best potential of ppc with e-commerce, not sure thought, because I did not try ppc on e-commerce websites.