Through my work at a ISP that serves a lot of farmers I'd have to disagree depending on what you mean by "internet tech savvy". I haven't run across any that sling code in their spare time but other than that, watch out!
I know of multiple groups (usually extended families) that have microwave radio links between their farms. They use this to monitor each-other's grain bins, crops, and security cameras. Not to mention WiFi To The Tractor for monitoring, IM, etc. There's no cell coverage so they find a way to get connectivity. I'd call that pretty internet tech savvy.
This is a large enough market that there's a company that essentially rebrands Ubiquiti radios, marks them up 100%, and markets them through farm magazines. I suppose in a way that's arbitrage on ignorance BUT it shows that there's a need.
You're saying they are tech savvy, but not internet savvy. If you are right (and I disagree that they're 'not internet savvy') then you've identified an opportunity, not a blocker.
The point gaius is saying above is exactly what I'm trying to bring across, but in a different phrasing. I just don't think it [Farmlogs] will be something they want/like to use.
With my experience, they are tech savvy in the sense of technology, but they are pretty anti-internet and don't trust a lot of apps and such on the web. For example, this Farmlogs site. For this companies sake, I hope I'm wrong, but I'm just going with what I know on my 2 cents here. And from what I see constantly from that culture, from a first hand view, is that they would never take an app like this serious (especially at that kind of monetary cost).