If you have a dynamic address, you may be willing to accept connections from a sub-part of your home connection. E.g. your ISP sets your home connection to look like 192-192-192-192-area1-san-fran-cal-usa, you could set tinyproxy to accept connections only from area1-san-fran-cal-usa (thereby ignoring the IP part of the connection). The risk is that other area1 subscribers discover your proxy and start using it.