Ted, I'm with you on the Lola--I think the Lola Mk1 body was (and still is) the prettiest of the '50s small engine roadsters, but part of its charm is it's so dang small. I've got one and I've messed with it lots, and I'm tellin' ya, if you put a Miata engine in it you might as well put in a head-high shift lever with an 8 ball shiftknob on top--it looks like a cartoon car, and not in Cars, like in Who Framed Roger Rabbit?...or in Car Toons with Rat Fink behind the wheel. The rest of the Lola needs to be expanded to fit the engine visually. However, the Lotus 11/15/17 front fenders look to like Frank Costin was channeling Captain Nemo when he came up with them, and though they worked on the racetrack (though not as well as the Lola, let's face facts here), for street use they restrict steering radius, tire size, and garage door width. The trade-off is, they sure say Vintage Lotus when you see them, and as you've pointed out, there's some value in that.
Even the Lotus 15, which is significantly bigger than the Lola Mk1, is less attractive than the Lotus 11 (in most eyes) due to the afterthought appearance of the bonnet bulge. History shows that bulge was in the plans from Day 1, but it still
looks like an afterthough (to quote Locost_John, "Just one look and it's no surprise to me they only sold 27 of them.
")
BTW, there's more to why the 11 outsold the 15 by a full decimal point--mainly that in its heyday, the 11 was basically a clubman (indeed -the- clubman, the only car a budget racer could be expected to plant him in the winners circle; it just didn't have much competition) and let's not forget that the Lotus Seven was an effort (a very successful one) to open up the 11 market with a cheapo body and some street compromises (like the ability to do U-turns instead of K-turns). By the time of the 15, Colin had begun to realized that the big money in race cars was in big money racecars, and the competition was pretty furious.