The market for props on betfair seems to be very little - not many betting these. I would have to create the market myself.
Bet365 dont like winning bettors - my limits were slashes to almost nothing after my partner and I won a little to much in there. They are a good place to bet, as they put up odds on everything, and they are slow adjusting to Line changes, but they dont like winning customers.
5dimes have a 100$ limit on props, and should be famous for whining when a customer wins a bit too much
thegreek has a 200$ limit, but only if you also play some of their other stuff. If you only bet props, your limits are slashes too 100$ pr bet as far as I know.
Looks like I have to create the market myself on Betfair, if we want any serious action.