I've only started shooting FITASC in the last few months, and love it. If there was more opportunity I would shoot it over normal sporting every time.
"clays cost the same, similar number of traps, blah blah blah"
My understanding is that to shoot new system, you need 15 traps per parcours, 4 parcours, so 60 traps. With ESP 10 stands of 2 traps equals 20 traps, some grounds use less, and some a few more. But I think that FITASC needs at least twice as many traps. In addition, you have effectively 12 hoops (stands) on a FITASC layout, with each stand large enough to have 5 traps on it. My conclusion is that FITASC also needs a lot more room that many sporting layouts.
I'm sure I'll be corrected if I've done the sums wrong.
Never seeing the same target more than twice comes at a price, but I much prefer that, over trying to straight 5 of the same pairs in a row.