Let me see now
Do I want to pay a one of cost of $1,000 per license and then have a small support cost every year of, say, $20 per license or would I rather pay a much smaller $80 per month for the rest of my life?
If you can force the bean counters to do some real accounting then a perpetual license is a no-brainer as if revenue gets tight you can stop the annual support and just stay on the version you have got used to using rather than pay an escalating support cost which means the software is continually updating and you never know where the button has moved to. Worst case, if revenues get tight you lose the software and possibly your data too if it was sat in the cloud