The cost of all Inscription trainer glyphs

Some project is going on with my DK, a hint to which may be the following. I took the time to work out how much it would cost to learn all the Inscription glyphs from the trainer. In other words, what it costs to learn all trainable glyphs. I went through Wowhead's listing of glyphs and broke them up into bands according to cost. The answer is as follows:

So it is only 150 gold to learn the lot. This is notable because reports on Wowhead say that the Inscription research may find glyphs you could have learned from a trainer if you didn't know them. So it seems best to learn them all before doing research.