Is the Mavic Pro Platinum still a viable purchase for commercial use?  

Good day. The Mavic Pro Platinum is still available in the market. The Mavic Pro Platinum is classified as a Consumer drone. I will be sending you a link ( https://store.dji.com/?site=brandsite&from=nav ) this link will contain all the prices of our drones and its accessories. Thank you.

yes, I use mine for property photos. Seems to me was the best bang for the buck while being 4k.

I would say YES it is.