That really depends on if everyone is really into customizing and designing their own Gyms, as well as if the GMs are willing to actually plan and figure out how paying into and customizing a Gym would work progressively. Not to mention whether it will give some tangible reward besides "oh, look how nice my Gym is."<br/><br/>It would probably be less complicated to just make that a story aspect where the characters are doing these Events specifically so they can pay for their Gyms, unless you would rather do it as a system thing.