Decorating many strongholds in full is very expensive, but the worst part of how decorating is expensive is the cartel market prices on decorations. One and consider that, ONE decoration costs 500 cartel coins. You don't get another copy and you spend so much on just one item for one out of eight strongholds at that. The decoration packs are well priced but you have no choice but to buy the deco pack otherwise the individual decorations from the cartel market are absurd prices or not on there at all. Which only ends up reflecting on the GTN prices of course...