Mac makes an excellent point. The software business has a colorful history of boom-and-bust cycles, and stage management software is unlikely be an exception to this pattern. I'd advocate a Plan B, as well as careful reading of the terms of use, transfer, etc. before committing money to any software package.
KMC's original question is interesting, however. I would be interested to see this survey broken out in a few ways. Institutional purchasers (like production managers, resident PSMs, resident ADs) might be more inclined to purchase, since it's not personal income they'd be spending. By the same token, students might be more inclined to buy, since a new software package could be tested and integrated into a school environment under the rationale of learning new methods -- again, without dipping into a student's person income. I would *expect* the group least likely to purchase is middle income freelancers. This group doesn't benefit from an institutional "professional development" fund. Their top priority is staying employed, and that often means adjusting their methods to the employer and team of the moment. Would this subset of SMs purchase this software?