Oh hey don’t worry about posting so much, that’s what we’re here for, for goodness sake. No one expects anyone to know "everything" so don’t be so hard on yourself O.K.?
Comet sounds like he is a picky eater although you may want to have his molars and teeth checked by a vet as that could be part of the problem. The pellets without veggies is definately not ideal, but it is OK. However the small amount of hay is a concern. Bunnnies need lots of fiber to keep things moving. Have you tried different hays? Have your tried mixing it? We’ve had several discussions about this very topic. You can also try mixing some flowers like lavender, chamomile, hibiscus and rosebuds in to get Comet interested and perhaps eat more. Are his poops normal or small, black or brown, soft or hard? Is anything runny?
If it is that he is a picky eater when it comes to eating hay, stop feeding treats to see if that makes him resort to hay rather than "junk" food. With the veggies, how many have you tried? Is his background such that he isn’t used to having this variety? What type of pellets are you feeding by the way? Are they alfalfa or timothy based?
Here are a few articles on picky eaters:
http://www.coloradohrs.com/articles/diet_misc_feeding.asp
http://www.coloradohrs.com/articles/diet_hay_crisis.asp