the TDNT Unabridged isn't worth it unless it is cheap. If one is doing a Master's thesis or PHD dissertation, commentary, then U would consult it. I think it is online to use. Its critical (liberal in its perspective). And certainly not easy reading. Do your own word studies and concult dictionaries is my advise.
I don't see how you come to the conclusion that its "... liberal in its perspective," as I have and use the Unabridged edition. In fact I found that this dictionary is very fundamental in its theology.
As to the pricing of this dictionary, as I have said:
As to what the price of these would be if developed for e-Sword, I don't know. However, I think and believe that if they were not out of reach as far as pricing goes, many would buy them, including myself.
The reason being is that I am well aware of just how much it is, considering I've researched the costing.
Currently eStudySource has only two premium Dictionaries for e-Sword:
- Nelson's New Illustrated Bible Dictionary (US $19.99)
- Vine's Complete Expository Dictionary of Old and New Testament Words (US $14.99)
And from AMG Publisher, Complete Word Study Dictionary (US $40.00).
And that's it.
With regard to who does use e-Sword, you would be extremely surprised. There is quite a number of Bible College, University Theological Undergraduates and Theological Post Graduates, and Seminary students who use e-Sword. Moreover, there are a number of Bible Teachers and Theological professors and Pastors who use e-Sword. And if you look at the type of content that we have for dictionaries and commentaries on this site, and look at the download stats for them, you will notice that those which have a large amount of seminary level type content in them do have a high amount of downloads for them.
I do not think nor do I believe, that when it comes to theological studies it just comes down to those who are doing a B.A .,or B.Th., M.A., or M.Th, or those who are doing their PhD., or DTh. I believe and think that when it comes to the TDNT, TWOT, and the BDAG being available for e-Sword as premium resources, providing the pricing is within a reasonable range, i.e., from about US$70.00 to US$80.00, it would be well supported. For these kinds of resources I would not expect them to be "cheap," as in around the US$20.00 price range.