[5][3] In 1979 Rozanski purchased Richard Alf Comics' mail-order division, with which he gained systems and methods for greatly expanding his mail order sales.

[5] In 1980, Rozanski purchased a double-page ad in mainstream Marvel comics, listing prices for back issues he had for sale.

This ad, which was the first of its kind, was a departure from the general practice of the time because of its inclusion of prices, which Rozanski explains was a way to educate non-collectors as to the value of their collections.

[11] In July 2014 Rozanski announced Mile High Comics would likely end its four-decade-long history of appearances at San Diego Comic-Con, due to the proliferation of convention-exclusive variants offered by publishers and toy manufacturers to convention attendees,[12] many of whom Rozanski criticized for attending the convention solely to acquire those exclusives in order to resell them at higher prices on eBay.

[13] Rozanski further criticized publishers for denying these exclusives to retailers, which Rozanksi estimates cost Mile High Comics $10,000 of losses at the convention.

[14][15] In 2015, after 29 years at that location, Rozanski sold the Migh Comics warehouse to a marijuana distributor, clearing one million dollars in the transaction.

[27] As of 2024, Mile High Comics has one remaining physical location, the 45,000-square-foot Jason Street Mega Store in Denver.