If there is 59 € availability between London and Köln, then there appears to always be 59 € availability to anywhere in Germany on any train. If London to Köln costs 69 € / 79 € / 89 € +, then travelling further into Germany almost always costs more and the additional cost depends in part on whether you use ICE (most expensive), IC or regional (least expensive) trains.
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Yes, this is fairly typical.
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I've tinkered with the idea of buying a London Spezial ticket, but no more than that.
Obviously the Euro 59 price is the most attractive, but whenever I've tried putting various dates and final destinations in to the DB website, the only journeys I've found at this price involve an overnight stay in Brussels. All other services seem to cost more.
Is this usual, or have I just not looked hard enough?
Yes, this is fairly typical.