Regarding advise for the upcoming artist, there should be statistics about the kind of sets that attract and keep collectors active, the ideal size, amount of chases, etc.
I think the right balance is 4-5 ERs/4 Chases, giving that they should be the most valuable cards. A set with 2 chases makes them lose their value fast with the new odds since everyone will have dupes after a week. Also, a set with more than 6 chases makes the ERs worthless. And finally, a set with only 2 or 3 ers makes trading harder, since, from experience, lately is easier to finish the upper levels than Uc or R.