Don't forget that Qantas still pays for it's pilots initial endorsement. Virgin and Jetstar will charge you 30-35K for this, not to mention you wont get paid while doing it. Qantas recruits get paid from day 1 so I reckon over the first year or two the Qantas guy will still be ahead.
Also just roughly speaking I believe most QF SO's will be earning at least as much as a JQ FO and most QF FO's probably make equal or better than a JQ skipper with Virgin pay slightly better than JQ
Also if all is so good at Virgin can you explain why thier skippers are leaving in droves to OS airlines whilst QF attrition is only 3%?