V-necks seems pretty specific. Also, Kids sizes would require a lot of changing, because resizing artwork doesn't always work out. Maybe once a week they do long sleeve?
LOL every winter, on every site I visit, this gets brought up. On the $9 and $10 sites, I doubt it will ever come about, but I've seen more expensive sites offer them. It brings a lot of extra overhead costs I would think to offer shirts in both long sleeve and short sleeve, and that would mean raising the costs for the consumer. IMO, it won't happen, but you never know....
Kids sizes are a different story though...
I'm going to start another thread for the kids' shirts.