There are two types of limit. Be careful of which limit you are getting into.

1. Trading limit - in which if you do not pay up on T+3 then force sale of shares (bought recently) in your account to repay.
2. Margin limit - in which if you do not pay up on T+3 then daily interest rate will be counted. If stock holding is below margin line, margin call will be triggered, in which any your shares will be force sold until reach margin line.

Both limit is temporary loan from the bank, don't use it unless you have the cash to backup on T+3.  Basically it is like your credit card but billing to pay up within 3 days.  

The more limit they give me the scarier it is..    my trading limit is in the mid 6 figures.. see also scared. I would prefer a much lower limit

No lar.. if portfolio in million then 7 figures leh.... somehow my IB gave me 1xstock & 3xCash limit.. so trading limit high only...

Yes you can request your broker to increase the trading limit in your account. However some stocks (ACE) cannot be used for trading limit. Other stocks should be 1xstock. Cash is usually given higher limit.

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Surprised to see the very good relationship between ROE and P/NTA (r2 >0.95).  Used data from about 190 companies (those which have been profiting for the past 3 years).

Takeaway for me is, if the P/NTA is high, ensure its ROE is also high. Otherwise, check the next company. 

My 3 cents.