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As with just about everything to do with cars, we're each going to have our own preferences.
What I immediately noticed in your post was: "It was different, fun and I liked it...alot" - That tells me that you naturally took to it and are likely to grow to like it more and more.
Don't think of it as an 'Auto' box but think of it as a Manual with some very clever and useful features - It's the best of both worlds - You can drive totally in Manual and pop into Auto for traffic jam queues or villages/towns etc. To answer your questions : -
1)
Does the novelty wear off? - Not if you enjoy it. It gets better and better as it all becomes fluid and natural.
2)
Have any owners who have had DSG gone back to manual and why? - I know of a couple but they started off not being prepared to learn all its different combinations and benefits.
3)
Apparently i've just on here that the clutch(es) last the lifetime of the car - can anything else go wrong with DSG? Someone has mentioned to me £600 for a control unit? - Things can go wrong whether Manual or DSG. The clutches are better protected from driver misuse in the DSG.
4)
Are there any additional servicing costs with DSG? - If your car is modified, it's good practice to change the DSG oil and filter more regularly.
5)
Is remapping an aftermarket jobbie or something VW do/did? - Aftermarket. Makes it even more like a Manual to use.
6)
Does the Edition 30 have the latest technology DSG box? - No, the Mk6 and bigger Audi's now have 7-speed. I've driven both Mk6 GTI and latest S4 and honestly didn't notice any difference - You still shift a gear whenever you want/need to.
7)
In the real world, is fuel consumption really better than a manual? - I don't think so. It's all down to your driving style - I use the gears a lot and never get over 30 mpg.
Hope This Helps