After you pay, drop or no drop doesn't really matters

Then why worry about the margin call? IF you pay one lump sum, then you can just wait for postman to deliver cheque to you on and off.

I think you trade too much on futures already. 

In equities, once you paid, no more extra money needed to fork out, unlike futures can be unlimited hole one.

After bought, what you concern is about the company ability to generate dividend to you or generate wealth to the shareholders, whether share price drop or rise doesn't dictate how much they will be paying.

debbieyss,

As what Cherroy mentioned, there is NO margin call like in Futures. You buy a stock, you pay after 3 days in full, and the stock is yours to keep forever (or until you sell). And of course, you will need to open a separate CDS account solely for shares.

I did that on AXREIT before (selling before dividend and buying back after dividend). Saves me 10% tax + I get it at a discount of ex-price

It should be the initial dividend rate before subtracting the 10% withholding tax to get the net dividend rate.