How much for high-quality financial leads?

I've had a friend ask me for info on something well outside the niches I work with - high quality leads for financial services.

Ballpark figure what should someone expect to pay for the highest-quality financial services leads? I'm talking people that have money to invest, have provided full contact details & requested a callback. I know the price is gonna be pretty damn high but I've got no idea how high!

Please note that I haven't posted in hire a freelancer, and don't PM me with offers as I'm only after info. My friend doesn't even have a business yet & just wants to crunch numbers, you'll be wasting everyone's time if you do message me.

This would be dependent on investment amount. Can vary greatly, is thisnlead looking to to invest hundreds or tens of thousands?

I imagine the highest amount possible - he's been employed in the industry for years & is looking to go solo. To get an idea let's say someone with $50k to invest.

To give a comparison, I know a client of mine was paying £50 GBP per double glazing lead. But these leads were pre-qualified in that someone had physically called them to confirm details and insure they were somewhat interested.

Ultimately the price will depend on what percentage of them convert.

Also, thread moved.