I dabble. But have ran into some problems since I started mixing with vg. I cant get the consistency right and it is not as sweet.
You can add distilled water, it doesn't take much, or a few drops of PGA. Shake the bottle and let it sit for awhile then shake again.
To sweeten add a few drops of Cotton Candy or EM (Ethyl Maltol). Some people use Sacrylose as a sweetener but I don't like the aftertaste.
Some chocolates almost double in strength after sitting for a couple of days so be careful not to add too much.
It's a lot of fun and I highly recommend it. It not necessary to buy a kit. Like anything else in forums there are always people that like to complicate things, but it's really pretty easy.