I only think in terms of desirability and long term sustainability. For me personally, I would want variants of Revival #1, and Bedlam #1. But, to pick a random one, do I really want a variant of Revival #9? Unless its a character first, or death, it almost seems like it becomes like IDW/Boom, printing a million covers of the same book.
Just some thoughts.
Agree +1
I'd like to see variants only when a issue calls for it like the examples you stated.Or spread them out to one every ten or twenty issues, for me it would make the variant more desireable.When I'm ordering new,or looking for back issues to buy I dislike it when there is multiple variants, gets to be overkill and I loose interest quick.