I think people somewhat overplay the 'not being able to loot' aspect. You can make a good amount of money looting only research components and gems/jewelry, each of which weigh 0.1 each. If you're soloing, chances are you're not going to be looting a lot of heavier items that are actually worth much (though you can get the occasional item worth 20-50pp doing Kunark giants in the 20s and up, for which a tinkerer's bag is useful; the tradeoff is that Kunark monsters in general have more HP and so you will be leveling less efficiently).
Also RE Kutsumo's comment, I would say that untwinked Shadowknights are probably better soloers than untwinked Monks. Monks can fear kite after a fashion, but Intimidate is unreliable and the monster is not snareed, which makes hitting it somewhat difficult. On the other hand, Shadowknights can fear kite properly, can snare the monster, and have a pet for free extra damage. Certainly monks are better soloers than rogues and rangers, though.
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