for some price can be an issue, some ppl have the vast majority of their gil going into personal projects (i spend every dime i get on dynamis coins to make my relic lol). that however is besides the point on this matter, generally if you want ppl to buy clusters for the run you should put that in the shout itself. if you plan to reimburse ppl for buying them that is also a good way to get ppl to help out with clusters and whatnot. however if you rip ppl off by telling ppl that you'll pay them back for them and don't (not saying you do, this is a what if scenario) it would only stand to reason ppl won't trust you to do what you say. in this game your reputation goes a long way.