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There's one potential spin-off series that I haven't looked at beyond the first volume, Essential Punisher. This is largely because whilst the Punisher first appeared in Amazing Spider-Man, by the time he acquired his own series he had moved on a lot from the Spider-Man "family" of titles and he was never really pitched at a similar area of the market. However, if there's demand for it then I may post my thoughts on his volumes at some stage. But that will be some time away due to other commitments offline.
Until then, so long! It's been a blast.