The question you have to ask, is how much people would pay to have quotes on their screen instead of being able to flip to another browser window showing quotes, for free.
I know I wouldn't. Would others?
Best way to find out is to do a bit of market research (put out the question to all members, how much do you think you would pay extra for those quotes on IH), calculate what the costs would be to do it, amortizing the programming and maintenance costs and adding in the quote server costs, set an initial price, figure out how many subscribers you need in order to make it worth doing, given the costs, then go to the board and say "okay, when I have XX firm orders, with credit cards, for an initial one year subscription, I'll do it" and let the market prevail. If it's a viable and cost-effective idea, you'll get the subscribers. If not, not.
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Many shall be restored that are now fallen, and many shall fall that are now in honor. Horace
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Price is a crazy and incalculable thing, while Value is an intrinsic and indestructible thing. G.K. Chesterton