I think sometimes folks bite off a bit more than they can chew...and run into problems. Other times the bike has a list of issues to start with, and they get ignored. Changing things to make them better is always a good thing.
To be honest here , I made alot of cosmetic mods to my bike, and this lead to alot of nice products that others ended up enjoying too...My lightbar, driver and passenger floorboards,rear turnsignal relocation bracket, the highway pegs bar, the invisable lowers, the grab bars, and the Dash.
All of these were bolt ons I added to my bike, that was completely stock. I never relocated the R/R , messed with the ACCT's , nor earshaved, degoated or even changed the bars. The bike ran like a freaking top the 5 years I owned it, and from what I understand is still going strong.
(I do however have a completely disassembled VN750 sitting in my garage that someday I will put back together.)
Stock bikes retain their resale value better, but come on, owners like to tinker, and many like to modify any bike they own. Try and keep in mind now that every Vulcan on the road right now is at least 3 years old...and most are older. They are not high priced motorbikes, so they do make a good choice for begining wrenches to practice on. Other than the carbs being a pain in the ass to remove/reinstall, the bike is very easy to work on...and there are proven things one can modify without causing damage that will in fact make the bike better if done correctly.
In a forum like this, you will always see folks who are haveing problems with their bikes,as rarely do folks post- " My bike is running beautifully , just thought you all should know" ... so it seems everyone has problems with their bike.... and as most Vulcans here have some mod done to them, it would be a bit remiss say that is the route of the problems.