Rincon Players: About those "mystery" offers?

I guess the offers for "mystery" free play amounts from Rincon are pretty common, but in my case there really isn't a mystery since the amount I usually get is about $10 above the stated minimum.

If the offer says my guaranteed minimum is $60 and the max is $5,000 -- I am going to get $70.

What's the experience of others?

I've never gotten more than the minimum amount offered. ST. PATRICKS DAY offer at Rincon today was minimum $100 and max $5,000 but I didn't go.

I usually get the minimum. But once, a few months ago, I got 1000.