I find this resale price discussion really interesting.
Just to play devils advocate a little to the above logic - I do believe drawing parallels to the GR Yaris' second hand sales is probably the best way to go, but you could argue they differ in a few ways which could genuinely impact resale values;
- 1000's vs 100's available.
- Similarly priced alternatives* available vs This or a 10 Y.O Porsche.
- Nearly 50% of the 1st UK owners are on this forum - arguably showing a high proportion of enthusiast owners who see this as a last chance saloon for this kind of car. You're essentially pricing in someone deciding they never want to experience owning this type of car (with a manufacturer warranty etc).
Personally I plan to hang onto the car for as long as possible (I do very few miles, so value should stay high). I do admit though there is a number at which I would have to put some thought to flipping (and it's definitely more than +£4k over RRP).
*Don't take my above comparisons as me dismissing the Yaris, I understand it is a special car and I would absolutely love one of those too! I also recognise we live in a different economic climate now to when the Yaris came to market, which may ultimately outweigh all of the above factors.