I just don't think it's necessary, that's all.
Haven't lost an engine to oiling issues in the 8 years we've built them, and I don't prime the oiling system, except after oil changes and after sitting during the 8 month off season. We do race 2-3 times a week though and use quality synthetic oil, maybe the original poster doesn't race that often.
People put 50,000+ miles on these engines in their motorcycles without the added top end oiler, and they didn't crank the engine for 30 seconds every morning.
Not going to hurt anything to do it, besides overheating the starter, just not necessary in my opinion