Re: CARVIN guitars, why are they not more popular ?
I played one of their double-cut models many years ago and did not like it. The heavy weight wasn't so much an issue (weighed like a Les Paul) but the neck felt like a brick with strings on it. The profile was fine, but the feel of the strings across the board was displeasing to me. Only other guitar I've ever played that felt that bad was a Custom Shop ESP (their old 90s Soloist copy).
As for online purchases and "taking a chance", you can at least get a general sense of how a neck feels from other models within a given brand. Fender, Gibson, Jackson, etc do not deviate too much from a handful of neck profiles, so if you've played one, you've played them all is generally a safe bet, though with some accepted deviation (Gibson's various "vintage" profiles, Fender's "Artist" profiles, etc). I've owned enough Jacksons over the years to know what model has what neck profile, and when I go for one that I have not personally held in my hands, I know what to expect when it arrives. There have been several that I did not bond with and passed along, but there was no definable issue with any of them - it was just "something" I didn't like about them. The same is true for most people and most brands - no matter how many of the same model you have and love, there's going to be one that seems to have something "missing".
And resale value is the last consideration one should have for a guitar.
I do have a Carvin VE212 cabinet with their British 12s in it, and it's a great cabinet IMO. Very clear and articulate, even at high volume. I've run a Fender RocPro1000 head, a Marshall JCM800 head, and a Mesa TripleRec head through it, and it remained clear and articulate with a very noticeable thump (so much that it rattled the light fixture in the ceiling, making the lights flicker each time I hit it). I would like to try their heads and combos, and have been interested in their bass amps for quite some time. One of these days.....