Predictable and extremely low costs for less critical stuff. My 2 main ones are respectively around 4 and 8 EUR per _year_.
I use them to run wireguard to evade geoblocks when I'm travelling, a few redundant monitoring scripts alerting me of reachability issues of more critical stuff I care about, they serve as contingency access channels to my home (and home assistant) if my primary channels are down.
I get no support, no updates, it's all on me - which is fine, it allows me to stay current and not lose hands-on practice on skills which I anyway need for my job (and which are anyway my passion). I don't even get an entire IPv4 - I get.... 1/3000th of it? (21 ports, the rest are forwarded to other customers). Suits me fine.
And it's always that price, apart from bandwidth overage on some but not all providers.