I send my stuff everywhere.
After doing some research, I was able to find my "reference" station I'm being compared to, which is an airport about 8 miles from my house.
I use the data I send to WU for all kinds of things, it's like my own database server. I have scripts that retrieve and graph my data, I have a page for AmericanWX forum for member personal weather stations, etc. CWOP I only use to make sure what I'm sending is valid data.
WU will drop you like a rock for invalid data or data that doesn't pass QC.