i have seen light leather selling at 15s a stack and at 10g a stack on my server , i am not sure if it did sell at 10g but that shows the crazy prices that can be seen , best bet is use auctioneer on a regular basis to get an average price you can probably sell at , at times the market gets flooded and of course the market price drops so low it is not worth farming the skins , so then you play the waiting game as the farmers will stop farming the skins , when the price gets back to the level you want to sell at then sell your skins ,
i do most gathering trades on various alts but what i also do is see if any drops are high priced at auction , quite often there are other things that can be farmed while you are questing or farming cloth/leather that make some real gold as a bonus to your normal income
as an example i am level 70 i farm motes of water as on my server 1 hours farming gets me at least 40g with other drops from the elementals perhaps another 20g+ on top, at lower levels there are other farmed drops that can make as much gold per hour , it all depends on your server though ,