JohnB well it is a pretty big expense to buy, and 10x cheaper to lease, so depends on the financial health of the company and overall strategy. It behooves vps sellers to buy for sure, just so they have more control, less worries about keeping their leased IPs clean. Seen lots of VPS hosts go under because of customer abuse causing their leased IPs to get pulled.
Could be some technical reason for the IP changes. Maybe they got screwed on the broadcom/vmware debacle and are in the middle of switching hypervisor or something lol