that particular call option has a lot of "open interest" compared to other October "deep out of the money" calls, so it is very liquid. For instance, open this link, look under October Calls and look under the "Open Int" column.
An option's open interest refers to the number of contract lots currently being traded on an option. Options that have been exercised or closed are not included in the tabulation. Open interest is somewhat similar to the volume of a stock, but for the sake of options trading it is much more important.
Here's why. Options trading tends to be a zero sum game. That is, whatever is sold by one individual there must be a buyer on the other side. If you own some option contracts and there is hardly any open interest, so to speak, it becomes less likely that you will be able to sell your contracts back to the options market. It is not uncommon for an option to have an open interest of zero. You should avoid such options at all costs. If you happen to buy some contracts, you will be the only person engaged in that option and there would be nobody on the other end to buy it from you. You'd then be stuck "eating" what you bought. You definitely want some open interest, but you don't want to be the open interest.
As a general rule, only trade options with an open interest of at least 100. An open interest of at least 1,000 would be better. And try to never hold more than 10% of the open interest. The more open interest, the more liquidity an option has.
IHUBfan, I'm expecting AAPL will bounce soon, but I'm cheap so want to buy some lotto ticket :-) also there is a lot buying for that particular strike compared with others http://finance.yahoo.com/q/op?s=AAPL&m=2009-01?s=APVAT.X
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