Its not a need really, I am just toying around and probably wont host. But I like having the skills to setup infrastructure of communication should I need to. Lets say Nostr becomes blocked and I want to spread info on how to self host these. Knowing which relay can act as a peer in an unreliable environment is big. Because those then interact with the bigger relays as a proxy but also serve as a local relay in situations where the upstream ones become unreachable.