You have to know your market - and if the software was any more expensive, someone would come in with a SFREP (or similar low budget) software to capture market share. And I guarantee Jeff, Cotality, and First American know what that price point is. Somewhat less than $1k/year. It still does not excuse the groups that spent zero effort in enhancing the experience of their users. Heck - ACI still looks like a spreadsheet.
I'd also note that there is an inverse relationship between # of users and cost for use. There (were) ~ 90k +/- appraisers for the longest time, roughly 2/3 of which used residential software - that's a lot of users. And honestly, when you calculate the functionality of the software, I think you have to bucket appraisal software with other productivity softwares - and as such, it's right in the mix.
I don't disagree that getting into the appraisal software biz RN would be a bad call for most.