As johnd has often pointed out the Davis products likely have more farm and institutional users than the hobbyist user. I did a quick review of the weatherlink.com map and within a 50 mi radius of my station there are 23 shown on the map.
3 - Institutional (PUC, golf course, University)
14 - Agricultural (5 farms, 9 seed companies)
6 - Personal
Now likely the agricultural are for their business knowledge and decision making so looking for least hands-on and weatherlink.com is an ideal solution. Many personal stations are by hobbyists so they may have their own site and not use WL.
In the City of London, ON (I am just outside on the fringes) there are 20 stations on Wundermap and only 3 on the weatherlink.com (some of these 20 are Davis stations that are not on WL.com)
On a further side note, in that same 50 mi radius there are 20 CoCoRaHS reports this morning and none of these are in the City of London and nearly all are farm or conservation authority related.
I feel like a lost sheep
Enjoy,
Paul