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This is very true.
However, I am sure there are a large swath of games that were/are ready for "release" of the virtual console that sit and wait to be released. I'd be surprised if it were a technical issue holding them back at this point.
Even if they are seemingly ready, they have to be tested extensively. It would look bad to release a VC game with a bug introduced during porting.
Besides, is around three games a week really so slow? Granted, they aren't all gems, but they are being added.
[...]all the big games everyone wants are going to come out one at a time
I doubt it. Everything so far seems to point to them continuing the pattern of releasing a few games every week, including a big title every once in a while. As has been said, it keeps the hype up about the VC.
For example, anyone else notice that SMB2 being added was posted on the RetroBlast homepage? It's good publicity when they release something they know everyone wants. They would loose a great marketing tool if they released everything at once.