...as I'm pretty much indifferent to the whole 
concept of an online gallery.

Anyhow, I think what gets people riled up about 
image theft is the hypocritical nature of those 
who do the thieving....  

Like the guy who steals your "crappy cel scans,"  
makes a wallpaper out of it, and then screams 
bloody murder if someone else dares to take 
his "artwork" and use it for something else.   

Or the person who gathers up every cel scan they 
can find for a particular series, removes all 
watermarks, and doesn't acknowledge any sources.  
Oh, but they have a FAQ and copyright notice 
warning people not to take images from *their* 
site.

Or the fancel artist who claims to be working 
from screencaps, yet by magical coincidence has 
managed to match the off-screen portions of your 
cel as well.

Or the leecher who thinks the word "cel" means 
some kind of weird JPG anime image, and builds 
their own online "cel" collection by pointing 
their image tags to your site.

Or the bootlegger who uses your scan to sell 
illegal mousepads, T-shirts, and incomprehensibly 
crappy all-region DVDs with Chinese and English 
subtitles on eBay...  all the while hiding behind 
eBay's greedy policy of tolerance for pirates who 
happen to bring in a lot of sales.

..etc etc etc...

If you don't have a problem with any of that, 
then you need not be concerned, I suppose.