I got a FlickrPro account partly because I was trying to figure out how to make some money from my photos (still working on that) but mostly for the bandwidth and storage issues. I will often take 1GB of photos or more on one trip if it's pretty, and I believe the free Flickr account  limits bandwidth (only 200MB a month or something like that), and you are right about it replacing your older images when you hit the limit. If you just want to use it for sharing photos, it's not a big deal to resize to low-res to avoid the bandwidth limit. I like to be able to upload full-res images for an off-site backup of my best images in case something should happen to my laptop.  That said, I've often been annoyed with some of the user interface features of Flickr, and have not really been making full use of the $25 I've been dropping for the pro account.  I figure it's less than you used to spend on film in a few months, and it's nice not to have to worry about bandwidth and storage.