Just for clarification, since everyone can set up their own page length, the system would not be able to specify a page number for a particular post as it caries from one member to another.
I have my page size sent to 300 items so that I can scroll through without having to scroll-page-scroll-page-scroll-page. When set to a high number, the <CTRL>-f works very well indeed.
Having a high page item count only slows the page load by a small amount. Plus, if you are using a wireless device, having a high count could save on your data limit as the system wouldn't be sending all of the page header/footer info every 20 items.