I'm someone who desperately needs the feeling of having possibilities, of going down new paths and exploring things. Poly offers the possibility of multiple partners in an ethical way, which is very important to me. I have the possibility of all these new options, structures, growth, learning. If I don't have the options of exploring, doing new things, I get very psychically trapped which is very bad for me and for people around me.
I have not yet managed to have multiple loving relationships at once so I don't consider myself as 'doing' poly yet but rather I have the potential to do so.
Poly as opening up new possibilties, even if I never actually have a poly relationship, is worthwhile for me. it helps keep that trapped feeling at bay.