i agree that PBase is not the place to expect folks to come clamoring to your virtual door asking you to take their money for your photos.
on the other hand i almost got one of my PBase jellyfish shots as a desktop for the iPhone! Someone from Apple apparently noticed it. It made it past the first Jobs screen but apparently they decided to reduce the number of screen backgrounds and so my photo didn't make the final cut.

. good news is that they were confused so they'd told me they'd buy the photo--after the first screen but before the second one which was apparently unexpected-- as a result i sent them an invoice and the full res shot. because i'd already invoiced them and they had told me they were going to buy the shot they ended up paying me a kill fee, the only money i've made from my photography!

i thought it was nice of them. i just got the check and i've got to send 1/2 of it to the folks at the Aquarium who own the rights.