Oh my. Having worked in the casino industry for 25 years I will usually inquire on a cruise what the coin in is to earn a point. I know most land based casinos are at and that is in the vicinity of $3/1 point. One of the cruises I was one it was $6/1 point. I haven't been in the casinos on Virgin so I haven't asked but I would guess it would closer to the $6 then the $3.
So, I could spend, let's say $15,000, to get free drinks while in the casino or $300 for a bar tab.