I'll rephrase to ensure I got your question. I believe you are asking that if one joined a group and a piece of gear dropped that was specific for off-spec, you'd like to know my thoughts if rolling for an off-spec is better than rolling for a glamour. Personally, if someone says "hey, can I get this for my off-spec", I'll pass. I damn near never care enough about glamours. To be honest, if no one else calls for it, I'd probably greed it for the vendor since I need gil far more than I need glamours. To be straightforward - if I wanted gear for a specific a class, I'd run it as that class.
Obviously. I'm not saying you have to think the same way - it's your $15/month - but it typically helps to put things into perspective.
