The problem with this is as a new/returning player, vendoring sparks gear is a legit way to get a quick early boost to your gil, allowing you to get the things you need, specially since selling skill up books has slowed down dramatically. As a veteran player, it's not really worth the time to do so, but it doesn't hurt, either, if you have no need for tales, skill up books, or CP rings (where a majority of my sparks go anymore, barely make more than I use on rings with Incursion).
Is the 50k cap really such a hindrance to people? I've never really found issue with it, except when doing a CP party in Dho/Woh Gates during the Exp daily; that caps you ridiculously fast with everything else tossed in.