Also, commercial tapes were sold for $79+ in the early days. That was a lot of money then. The home video market only took off when the industry finally decided to lower prices to around $30.
In fact, in the USA, it was "ST II: The Wrath of Khan" that broke the $79 threshold and came out at the ridiculously low $29. IIRC, a chain of pizza restaurants offered Paramount Home Video's latest release, ST II, for that low price - and this opened the floodgates.
Here in Australia, we followed the excitement with great interest. I already had my Beta copies of ST:TMP and "Barbarella" (both were $AU 79). ST II was due soon, but when it arrived it was also $AU 79. I organised a bulk purchase at my local video shop and got six sell-thru copies at a 15% discount.
A few weeks/months later, Australian "Pizza Hut" restaurants had a special offer: selling Paramount's "Raiders of the Lost Ark" for $AU 29! How frustrating! Missed it by one. The prices of all sell-thru videos in Australia started dropping across the board.