For T3D :
The company should be clear , and say how many updates they plan , and the price.
Not hangging the customer by surprise saying :
New version is here, spend some more 50$ if you want it !
Specially when customer didn't know it.
That's somewhat like forcing them to pay because they need the next version
They should be transparent at least, and not taking decision, that don't let lot of choice to customers.
I think if they continue that way, some of them won't appreciate and turn back to another 3D engine !
That's a particular case for you !
Not all people can buy the Pro version.
For a lot here , that know they perhaps not reach production or selling a game, the commercial is really enought.
I think Pro should be purchased once you found some publisher or once you have succed to sell one game, than why not saying
"ok i know how to go from making to selling and i done it, so now let's do another game but with better features of Pro version"
Well it's just my way of thinking in game making.
Indeed anyone can direcly buy Pro version if they want all Pro features now directly !