It also shipped with only 1MB RAM. Anybody who tried to get by with that small amount too long for the entry price, found themselves out of luck if they needed to upgrade since it required a non-standard RAM board

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Yea, that entry level config also didn't have any hard drive built-in and was simply to replace the Plus period at a lower price, which I am sure tempted many buyers. Because of the lack of these two things, it was not ready for System 7 out of the box which was released 6 months after the Classic! There was a better more expensive config with that non-standard RAM board already installed resulting in 2MB of RAM and a 40MB hard drive installed too that was ready for System 7 (which needed both of these things) and you could then get 2 standard 1MB SIMMs and install it on the non-standard RAM board later, resulting in 4MB of RAM which was the max.