I think this is already common, especially on the new wave of gTLDs.

I registered a ".plus" domain for $2 a year for two years. It made a decent domain hack for a project.

After two years, the renewal price became $20-ish. The project had a new name by then, so I didn't renew.

The same happened for a personal Chinese domain (.网站 I think) that I had for a couple of years while I was learning Chinese.