I know these aren't everyones thing but following a disaster festival where I had alot of places, I've decided to try and play e/w more often early doors.
In the context of roll ups, it's interesting to note that bet365 will allow you to go e/w on a roll up even if the first leg is football or any other non-racing event. I typically play american sports O/U which are priced anywhere from 8/11 - 11/10 and football bets, so this is giving me an avenue into reducing the e/w impact.
I haven't looked at everyone, but I know that skybet doesn't allow this.
As a side note - I'm in 2 minds about whether rollups are something I will continue with, I suspect it's more a microcosm of my festival, as I had some great ones rolling to Kopek, Fact to File and Teahupoo and a decent e/w win on Bob O thanks to them, but when following it properly nearly 20% of my outlay was failed ones. Perhaps I should just be more selective with them.