ThemeForest is a great platform for WordPress themes and plugins, unfortunately from the marketing text that you buy everything with a one-click installation, this is not true. You still need at least basic knowledge of WordPress. OR it's easier to hire a developer to make you a site based on the purchased template. You can't get this for $50) - The developers are not obliged to do this for free just because you bought the theme, this is paid for separately. - server, security settings are all on your side, wordpress and themes have nothing to do with it. * yes there are bad ones, but there are also good and solid themes and this is one of the best marketplaces for this.