It all comes down to the hobby factor. For some, building the machine, setting up the OS and tinkering with no real goal in mind is the purpose of the machine itself. For others, their computer is a tool, so a computer with little use would be considered superfluous.
I am somewhere between the two. I know that anything I can do on my A4000 I could do better on my MacBook, either using OS X apps or using UAE. But I like to have the real thing to tinker with from time to time, even though I know it's not cost-effective or time-efficient.
I *had* a PegII, but I realised that I had spent a lot of money on it only to find I did nothing with it that I couldn't already to with my A4000, so I sold it. The EFIKA would be a nice, (relatively) cheap way to tinker with MOS so would fill both needs. Also, I have always wanted to build a custom case with a small motherboard, so I might as well make it an Amiga-like machine :-)
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moto