Things are only worth what someone else is willing to pay....never the actual investment put in...that said if something can't be replaced/repeated it has a rarity value.I have paid over the odds to be the owner of rare stuff, but only to the value I place on it...
Are Whiscombes worth the money asked...well engineered, beautiful finish and extremely capable of doing what it says on the tin....+RARE...
If you have the money and the desire then YES, if it's just to do a job then NO....
In simple terms do you buy a Ford or a Buggatti, both will get you from A to B...you could pimp your Ford but it's always a Ford!