You would think not being able to process leather would prive a set-back but it isn't really if you think about it.
Ruined leather scraps are of course most of what you'll get at lower levels, and those will be worthless of course. However then you start getting more light leather, and later Light Hides (Rare so BIG bucks at AH), then Med Leather, and on up. Now this is of course if your going to take your char up some since your not going to get light hide from a mob outside your starting area, probably level 10 REALLY rarely, around level 20mobs you get more 2xLight Leathers, Med leather, light hide, med hide (rare, like level 10 and light hide), however there will always be a market for these rare skins.
I've heard good things about herbilism, but mainly to NPCs or a friend who does Alch.
Personally I like the mining/bars for profit but the problem is, imo, that mining is about the only thing that doesn't need a main (aka non-gathering) skill to reach full potentionall.
You could try mining/tailoring and make bags and shirts and all. Bags are ALWAYS wanted, at least 1 time every 10 min or so in a major city I hear something on trade about any tailors can make me a bag... Charge a small fee of like 1s if they have all the ingrediants and your set. Shirts are nice, although I don't know if I would outright buy one but some people ask for them.
Anyways thats my 2 cents, for what good it is since i've never done anything but skining/leather.
Oh and if you found a friend who was a leather worker you could provide him with the scraps, or heck send them to your other char who has leather to process.