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You don't need credits to cover your whole WL. Just keep an eye on ones you are near the top for so can judge your credit situation. (Unless of course you have a big stash of credits). I usually have a stash of 15-20 credits. I'll put my shelf on hold and autorequest my whole WL. Then once that dwindles down to like 5-10 credits, I'll come off hold and post WL books if I'm not getting shelf orders. I do this for postage budgeting and because letting my credits dwindle down inspires me to read some of these WL books I have collecting dust in Mt TBR.