I disagree, IMO body kits are silly bits of plastic boy racers clag on their cars for unknown reasons!
What other boring runabout could you get for £1400 I ask?
On the contrary! This particular kit is (always to taste) but subtle and very VERY few cars had them. Rocking horse poo costs a lot.
Please note I wasnt being derogatory to your purchase, I'm sure it is a good motor and a good price, but comparing yours to this car from a breaking point of view is not logical.
I know you're not being derogatory mate! 
I know it's all down to taste, each to their own and all that, but is the irmscher kit really that sought after? Excuse my ignorance in this, but wouldn't have thought it would be such an issue on these cars. i would expect it to be more relevant on something like a Saxo (in a non judgemental way!)
If you were to buy that car this second, you could easily sell the kit and wheels for approx £2k on eBay. You then have a fully functioning Omega to either put standard stuff on and use or sell, or, break the lot and make even more money.
So, yeah, it is very sought after.