My initial thought process was to just throw this together quickly and put it out there. However as anyone who writes programing code will tell you, there is no such thing as throwing code together, not if you want it to work anyway.
I have been working on this little venture with all the spare time I can muster. It has been almost two months now. Through Beta testing I have discovered problem areas which have been resolved and I think I am down to just one. That is code signing. You know those pesky warnings that Microsoft gives you when you install a program, those about "This type of file can harm your computer"? The only way I have found so far to get rid of it is to pay a ransom. Code signing certificates are any where from $150 - $400 and only last for a year. All they do is prove that you are who you say you are, or that you have fooled them in to thinking so anyway.
When I release the program, anyone can download it for free and register it as a trial version. It will be limited in functionality but you will at least be able to see what it looks and feels like and then decide if you want the full version. In the trial version you won't be able to create the auto zeroing g-code but everything else such as stepper calibration, Parts Book, Recipe Book, Contact List and fine tuning will work normally.
With all that said, I believe that I can offer this to current owners of the Triquetra for a very small upgrade fee. I haven't decided on just what that is as of yet but I can assure you that it won't break the bank and will be worth it. I have added several options since the video. Some of which should have already been there and others are requests from Beta Testers.
Speaking of Beta Testers, if you would like to get in you will get the program for free if you are a current Triquetra Owner. If you want in just send me a private msg here or email me at email@example.com. I will send you the necessary info and upgrade your account so you can access the download page on my web site.
I know I haven't given you a specific answer to your question about cost but that is only because I really don't have one at this time other than to say that I can assure you it will be very affordable. Evan to the point that you'd be silly not to give it a shot.
Thanks for your inquiry,