It's more likely the Mirage trades just weren't selling that well outside the Ultimate Collections. They made 10 Mirage Volumes after that (which was the guest issues of Vol. 1 and Vol. 2), and they made 8 Tales trades.
Altogether that was 18 TPB's, but I don't think sales were too great. I don't think we've seen the last of Mirage trades from IDW and I'm sure they'll print more stuff eventually, but I can understand the break.
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