Kinda depressing to realize that I'm probably older than your dad because I remember paying about $560 for 16mb RAM in about 1995, and that was to upgrade the 2nd computer I owned. (I also remember about a year earlier, thinking $400 for a new 1.0gb hard drive was a great deal -- forget megabytes, we're in the future now, an entire GIGA-byte baby!!!)
I think the difference here is that the first few comments are referring to PCs, i.e. "Personal Computers". Everybody has a story of wildly expensive equipment that their employer purchased. Or worse, spending tens of millions on something like a data warehouse or ERP system and then limiting compensation for the individuals tasked with extracting value from those systems to $90-120,000. But now we're way off topic...
Of course room-sized computers from the days of NASA were incredibly expensive. I was just replying to a comment about 4MB of extra memory for a PC in the early days.
