TY Soggy,
You are correct that Advanced is a better description, but how many Fellowships have 25 players with a decent level ... I know I hear the same answers, but if you have a fellowship of 12 to 18 and four or five are not very active, then you have limits on what is possible.
The advanced, 25-person FS is going to get better tournament prizes than the FS of me and 3 of my friends. But that doesn't make the tournament bad for my FS.
Once you get to Ch 4 or 5, you can just auto-fight a few squads to clear say 3 provinces to 4 stars. That might take maybe 10K or 20K supplies. So you turn 20K supplies in KP (not a great conversion rate until you start buying KP, as Soggy mentions), relics (which are otherwise in limited supplies), broken shards (can't get them elsewhere), spells (which you can't cook without relics), and runes (which require you to clear provinces - again limited supply).
And that doesn't even touch on using tournaments to get your boost levels up to 700% (which is the best thing to possibly do for your city).
In my beginner city (currently in Ch 4), I usually do tournaments with auto-fight (no catering) until I lose 2 fights in a row (I'll usually tweak battle comp if I lose). So usually I get 6 provinces to Stage 1, 4-5 provinces to stage 2, 4 to stage 3, etc. etc. And all that costs me is supplies.