costs are nothing. you have a computer and net connection already.
you *will* want to add more ram tho.
i'd do 512MB.
stability depends on the number of clients connecting. I can leave my client logged in to my server for days w/o problems... zoning around and working on quests etc.
Then i've played on guildwars2 where you can go LD every 5 minutes just sitting there. Depends on the number of clients in the zone/on the server.
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