Limits are very easy to get increased. Verification of account details is the first easy step and typically results in a $500/day limit. Beyond that, once one reaches that limit, it takes literally 2-3 min on their 800# to raise one's limits (permanently) again.
There are lots of factors involved in the limit selection, but account balance is a big one also. If you hit a big score, or deposit a lot, call them up (or do live chat). Very fast, efficient way to get limits raised.
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Kahn