Yes, you can use contributed modules to control access to content by role, and then use another module like the magical lm_paupal module that will allow you to sell access to those roles to public users in an automated fashion. Ecommerce module will also allow you to sell one role, if your site is simple. you can also sell single file downloads with the quickfile module. you can find all these modules on the downloads/modules page listed by name.
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Yes, Drupal sells stuff!
Yes, you can use contributed modules to control access to content by role, and then use another module like the magical lm_paupal module that will allow you to sell access to those roles to public users in an automated fashion. Ecommerce module will also allow you to sell one role, if your site is simple. you can also sell single file downloads with the quickfile module. you can find all these modules on the downloads/modules page listed by name.