But USFS offers tons of events for low level skaters too. Now, not the 19 that one skater at our rink is doing at isi worlds, but I could have entered 5 events at a recent Usfsa competition. Plus they have entire events like National Showcase dedicated to artistic skaters. So I think USFS is trying to dig further into ISI's market.
Elite skaters don't compete artistic programs (unless they go to specific competitions for that), but most have to keep an exhibition program current. You always get a story of someone choreograping in the hotel the night before though. I think the fundamental reason is that elite skaters are skating for a specific purpose: to represent their country, win medals, make it to Worlds/Olympics. By that point, I hope all are still having fun, but it has become a job. Lower level skaters may aspire to make it to that, but the skating organizations have to keep them interested: make it fun. All the additional events are fun, and it gives skaters a reason to keep practicing.
Besides, after watching a low level senior man train a long program, I can see why 2 is enough. It looks killer.