Scott, Having used GPS since 1998 I can confidently say that GNSS was well worth the extra cost. Earlier this year we purchased our first GNSS receivers. We work almost exclusively in RTK. I am not sure what you're basing your tens of thousands of dollars on. If you are trying to replace an entire fleet of equipment then maybe. The cost that I have seen per receiver is well worth it after having used it. We are getting shots that are impossible with GPS alone.