Is it typical for a series to have variant covers for every issue or is that usually just a first or first few issues type of thing? Star Wars #1 had a nearly limitless number of variants (63 I think) and then I found out recently the issue #2 had a handful. Darth Vader #1 had a bunch and #2 had 2 of them that I know of. I'm a bit of a collector... am I setting myself up for a massive investment if I want to keep investing in variant covers for every issue or do they eventually stop?